Answer:
the answer B I took the test
Nitrogen is important to life because it is a key part of amino and nucleic acids. Also, it is an important part of ATP, which is the basic energy molecule for living things. Neither plants or animals can obtain nitrogen directly from the atmosphere. Instead, they depend on a process known as nitrogen fixation.
Taste
Taste buds or taste receptor cells in the tongue allow a person to taste the different flavors of the food he or she eats. An average person has around 10,000 of these cells, which gets replaced every week or two. As a person gets older, cell replacement is much slower and some of these cells do not get replaced anymore. An older person may then have only about 5,000 working taste buds.
Answer:
There are 4 trophic levels in the following food chain.
