Why is the dark reaction called a cycle? the products of the dark reaction are the reactants of cellular respiration. atp is used at multiple steps during the chemical reactions. rubp made during the dark reaction is used to start the reaction again. glucose produced during the dark reaction is a ring-shaped molecule.

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior

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

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different