Answer: Mercury has been well known as an environmental pollutant for several decades. As early as the 1950's it was established that emissions of mercury to the environment could have serious effects on human health. These early studies demonstrated that fish and other wildlife from various ecosystems commonly attain mercury levels of toxicological concern when directly affected by mercury-containing emissions from human-related activities. Human health concerns arise when fish and wildlife from these ecosystems are consumed by humans.
During the past decade, a new trend has emerged with regard to mercury pollution. Investigations initiated in the late 1980's in the northern-tier states of the U.S., Canada, and Nordic countries found that fish, mainly from nutrient-poor lakes and often in very remote areas, commonly have high levels of mercury. More recent fish sampling surveys in other regions of the U.S. have shown widespread mercury contamination in streams, wet-lands, reservoirs, and lakes. To date, 33 states have issued fish consumption advisories because of mercury contamination.
These continental to global scale occurrences of mercury contamination cannot be linked to individual emissions of mercury, but instead are due to widespread air pollution. When scientists measure mercury levels in air and surface water, however, the observed levels are extraordinarily low.
Explanation:
Mercury can accumulate in biological systems and then pass to humans after consumption (in this case, fish consumption).
What is bioaccumulation?Bioaccumulation can be defined as the process of accumulation of chemical nocive substances in biological systems.
Mercury is a toxic metal that bioaccumulates in life forms such as fish and then passes to humans, which is a serious threat to health.In conclusion, mercury can accumulate in biological systems and then pass to humans after consumption (e.g., fish consumption).
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-identify the independent variable/dependent variable.
which plants grew taller:those in the experimental group or those in the control group?
-Describe why this is a controlled experiment.
Explanation:
a control group does not. They should be identical in all other ways.
List the characteristic features of epidermal cells.
Answer:
Epidermal cells are tightly linked to each other and provide mechanical strength and protection to the plant. The walls of the epidermal cells of the above ground parts of plants contain cutin, and are covered with a cuticle.
Compare ionic solids and liquids
Identify the chemical change below
A.a piece of wood burns in a fire
B.two pieces of paper are stapled together
C.a large log is cut into boards
D.water is removed by drying wet clothes on a laundry line
A peice of wood burns in a fire is the answer
When members of populations do not mate with each other or cannot produce fertile offspring, they are
Somatic cells (also called body cells) are found where? Check all that apply.
A heart
B lungs
C sperm
D muscles
E eggs
Why is technology not the solution to all scientific problems?
Answer:
Science can not solve all of our problems. While scientific understanding can help battle things like disease, hunger, and poverty when applied properly, it does not do so completely and automatically. Furthermore, there are many areas of life where science can have little impact.
At birth, what is the average number of red blood cells per
mm of blood?
what do foxes sleep on? A.beds B.fox nest C.trampling
Answer: B. Fox nests
Explanation:
Foxes dig out dens to provide a safe underground space that is mostly used for raising fox cubs, also called kits. In urban areas, the dens - known as earths - are commonly located under sheds, but they can also be among tree roots, in bushes or on railway embankments.
43, Square root of 40 , Square root of 13 , Square root of 7 , 14 over 9
Answer:
64
Explanation:
Which category is the dependent variable?
Answer:
the answer is no.2.
Explanation:
i am not sure about it
As latitude increases,___.
temperature increases
O temperature decreases
biomes increase in size
biomes decrease in size
Answer:
As latitude increases the temperature decreases
A community that has progressed so much that it is stable and balanced
1.
Mention any four importance of electricity in the present days?
Answer:
lighting, heating, cooling, devices
Explanation:
you have to have electricity for the following or you would not be able to change you phone
Which element is found in nucleic acids but not in amino acids
Answer:
Phosphorus
Explanation:
Answer:
Phosphorus
Explanation:
I took the quiz
In a water molecule, the electronegativity of the oxygen atom is high where the
hydrogen is low.
Draw the directionality of the pull between the hydrogen and oxygen atoms.
O
Answer:
drawing
Explanation:
Draw:
Draw 2 water molecules, H2O. connect the Hydrogen to the Oxygen.
Of the following, which are examples of a protein?
enzyme
chitin
steak
RNA
kidney
bread
honey
body fat
DNA
glucose
peanut butter
lard
olive oil
cholesterol
hormone
7. Mrs. Everhart developed the theory that all bulldogs are great pets. After all her bulldog Meatball is a
wonderful dog! Is this statement a scientific theory? Why or why not.
finoccientific method
Answer:
No it is not a scientific theory.
Explanation:
An explanation of any aspect of the natural phenomenon of the world that can be tested several times and well supported by the evidence, and follows the scientific method. Furthermore known as scientific theory.
Presently, a logical hypothesis must meet a few rules, and one of those is that it must be upheld by a few (and free) strands of proof.
For this situation, we have just one hypothesis, that bulldogs are great pet and Meatball is great among bulldogs, and it isn't sufficient, at that point it can not be a scientific theory.
Choose all of the physical changes:
(There are FOUR)
Group of answer choices
tarnish
evaporate
bend
react
melt
explode
dissolve
Answer:
evaporate, bend, melt, dissolve
Explanation:
All enzymes are examples of organic molecules known as?
Answer:
PROTEINSExplanation:
Many important molecules in the hman body are proteins like enzymes, antibodies, e.t.c.
Enzymes are a type of protein that speed up chemical reactions.
All enzymes are examples of organic molecules known as proteins.
Proteins are large biomolecules composed of one or more chains of amino acids that perform a wide range of functions in living organisms. Proteins are essential structural and functional components of cells, tissues, and organs.
Enzymes are biological catalysts that are produced by living cells. They are typically composed of one or more proteins, which are long chains of amino acids that are folded into complex three-dimensional shapes. Enzymes play a critical role in many biological processes, including digestion, metabolism, and DNA replication. \They work by lowering the activation energy required for a given chemical reaction to occur, which allows the reaction to proceed more quickly and efficiently.Therefore, enzymes are proteins, they are considered to be organic molecules.
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what is photosynthesis
The term used to define a cell that has a nucleus containing DNA.
a) Autotroph
b)Prokaryote
c) Eukaryote
d) Homeostasis
Answer:
The answer would be C eukaryote the cell that has a nucleus containing DNA I can't show a picture of it but I can tell you for sure that is that answer
Match the level of ecological organization described by each of the statement below. The birds,insects,plants,fungi, and other organisms that reside in a nearby wetland
Answer:
Community
Explanation:
The community is the compilation of the different plant and animal species population in a designated area at a particular time that interact with each other. The different species in a community have interactions with one another based on trophic levels and the supply and provision of nutrition for survival
The ecological level above the community level is the ecosystem, which is concerned with the biotic and abiotic interactions
Beloe the community level is the population, which are the number of a particular species in a location at a given point in time.
Which statement best explains a way in which a cell gets rid of wastes?
A. The nucleus provides the instructions for making proteins from
amino acids.
B. A chloroplast converts energy from sunlight into organic matter.
C. Mitochondria change energy stored in organic compounds into a
usable form.
D. Vacuoles merge with the cell membrane and then open.
Answer
D. Vacuoles merge with the cell membrane and then open.
Explanation:
Answer:
D
Explanation:
I took the ∆pex quiz
Using radio telescopes, astronomers have found evidence
that no new matter is forming in the universe, which is
what the big bang theory predicted.
This work is part of which process used in developing scientific theories?
A. Using new technology to provide additional supporting data
B. Using imagination to spark new ideas
C. Using new technology to replace outdated theories with new ideas
O D. Using new data to modify an existing scientific theory
Answer:
A
Explanation:
Scientific theories are explanations of natural phenomena that have been repeatedly examined and verified using the scientific process of observation, measurement, and analysis. Therefore, option (A) is correct.
What is scientific theory?A scientific theory is an explanation of an aspect of the natural world and the universe that has been repeatedly tested and corroborated in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of the results. In other words, a scientific theory is an explanation of something that has been proven to be true through the scientific method.
Einstein's Special Relativity, which describes the relationship between space and time for objects moving at a consistent speed in a straight line, is one of the most well-known scientific ideas. It also happens to be one of the most controversial. Additionally, the concept of time dilation is investigated by this theory.
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TOR kinases are enzymatic proteins found in a diversity of species, from yeasts to mammals. They serve in a phosphorylation cascade that promotes progression through the cell cycle. What evidence would confirm that eukaryotes share a common ancestor with regards to cell signaling pathways?
Answer:
By phylogenetic analyses
Explanation:
The target of rapamycin (TOR) is a major regulator of growth only found in eukaryotic organisms. The TOR pathway is known to regulate critical cellular processes including, among others, cell growth. The TOR protein is a kinase capable of activating translation by phosphorylation of the ribosomal S6 kinase (S6K) and the eukaryotic translation initiation factor 4E binding protein (4E-BP). In this regard, phylogenetic studies have shown that this pathway involves duplication events of ancestral kinases, as well as sub-functionalization of the S6K kinase.
Which one of these is not a volcanic island arc? (Consult a plate tectonic map if needed) Group of answer choices Hawaiian Islands Japan Indonesia Aleutian Islands
Answer:
Hawaiian Islands
Explanation:
A volcanic arc is made of volcanoes and is formed above the subducting plate and examples include the marina island in the pacific ocean and lesser Antilles. Sundra arc is a volcanic arc and the Hawaii islands are an example of the linear chain of volcanoes.is auxin one of the most important group of plant hormones
Answer:
yes they are
Explanation:
because auxin are the most important hormones involved in adventitious root formation.
Answer:
Yes!
Explanation:
Auxin is one of the MOST important group of plant hormones! They promote the growth that is needed for plants. They produce the stems and the buds, and the tips of the roots for the plants. Without it, things would go bad, and a lot of things would go awry.
I really hope I helped you with this question!
Give one example of how the testing of Platismatia glauca could benefit future ecological research of this forest.
Answer:
Testing Platismatia glauca could help scientists understand which pollutants have the largest effect on lichen populations. It also may help scientists understand the current pollutant levels in the atmosphere compared to the population of lichens on the trees. This information can help them more accurately predict population changes over time.
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explain why a large tree and a crop such as rice or maiz are both classified as plant
Answer:
because the all need sun, and oxygen, water to grow. I really don't know how to answer so I hope the answer above help sorry if it doesn't
Explanation:
Answer:
they both produce their own food
Explanation:
photosynthesis is a large part of their life