The theory of universal common descent argues that
question 2 options:
cells without a nucleus evolved long after the existence of cells that contain a nucleus.
all cells contain a nucleus.
all living things descended from a single ancestor.
all cells have nothing in common.

Select the correct answer from each drop-down menu. during the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird