Trace fossils are recognized as evidence of what pre-existing life?

(a) plants

(b)plants and animals

(c)animals

(d) neither plants nor animals

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Which is a function performed by stem cells in the skin a. replacing lost skin cells b. making cells for the intestines c. growing new organs d. differentiating into brain cells plz apex