Answer:
d
Explanation:
as a result of accumulation of waste products in the body , these substances are removed from the body via the skin hence they undergo cellular respiration
Answer:
Explanation:
Never still, the earth and its environment are constantly changing. ... Surviving in a changing world is difficult if an organism cannot change along with it. ... Slowly, the population of fish will become more fully adapted to its new environment. ... Sometimes the changes cannot take place fast enough and a whole population
All cells come from pre-existing cells
