Answer:
Due to environmental conditions.
Explanation:
With the passage of time, environmental conditions change which causes the evolution of of four legged land animals from fish like creature. This change occurs due to change in environment. In water, there is no need for legs because fish moves with the help of fins and tail but the organisms that lives on land has legs in order to move from one place to another so we can say that change in the physical structure of organism occurs due to environment.
I wish. sounds fun to me honestly vs. calculus lol
Answer:
DNA is the molecule that stores genetic information and directs the production of protein that makes cells unique and suited to their functions.
Explanation: