The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. Using the model, evaluate each of the claims and
select ALL that are correct.
A)
Bacteria is essential to making nitrogen usable.
B)
Denitrification returns nitrogen to the atmosphere.
09
N2 is the form of nitrogen most used by plants,
D)
Fertilizers containing nitrogen are carried in runoff to lakes and rivers.
Eliminate
19
E)
Nitrogen fixation from lightning returns nitrogen to the atmosphere from
the soil
no

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?