Before nitrogen can be used by living organisms, it must be converted to water-soluble:
(a) ammonia.
(b) nitrates.
(c) nitrites.
(d) nitrogenous wastes.

B Nitrates

Explanation:

No explanation here sorry •~•

nitrates

Explanation:

if u watch a video base on nitrogen cycle it will show the answer and it is nitrates

your answer is "the 1950's"

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.