Which of the following answer choices best explains what process lead to each cells' unique structures and functions?
Choose 1
A series of specific mutations allowed the brain and kidney cells to become specialized for the
structures and functions they possess.
B
Apoptosis allowed the brain and kidney cells to become specialized for the structures and
functions they possess.
Differentiation allowed the brain and kidney cells to become specialized for the struct and
functions they possess.
During fertilization, a sperm cell fused with an egg cell, resulting in a zygote.

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answer is

human impact on the environment can be seen in the deterioration of the !

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the scientific method.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.