What chemical bond is responsible for the paring of the nitrogenous bases in a dna molecule?

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?