Carbohydrate-synthesizing reactions of photosynthesis directly require A. darkness

B. oxygen and water

C. products of the light reaction

D. light

E. chlorophyll and carbon dioxide

Which of the following would most likely be key to gathering evidence that the rna world hypothesis is valid? creation of suitable environments for long-term study of single-celled organisms simulation of early earth conditions and long-term study of the resulting molecules development of a system for studying the microsphere's ability to absorb additional molecules categorization of the different specific conditions that result in the development of microspheres

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Identify the structure in organisms that do not have kidneys that is adapted to regulate water balance