What function does the limb serve in each animal? How are the limb bones of the four animals simila? Based on these similarities, what can be inferred about the evolution of the four animals?

The function of limb in the human body to hold things, in dogs the function of limb is movement, in birds the function of limb is to fly and in the whale its function is to swim in the water.

Explanation:

The function of limb in the human body to hold things, in dogs the function of limb is movement, in birds the function of limb is to fly and in the whale its function is to swim in the water. All the organisms are evolved from a single ancestor about millions of years ago. Evolution occurs in organisms with the passage of time when they are experience different environmental conditions.

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.