The waste product of respiration in animals is:

oxygen
starch
carbon dioxide
energy

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

What are some natural processes that represent physical and chemical changes?