Adenine base pairs with thymine using bonds, and guanine base pairs with cytosine using bonds. three hydrogen, two hydrogen
two hydrogen, three hydrogen
three phosphoester, two phosphoester
two phosphoester, three phosphoester

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants. d- food molecules are broken down in the cells if living things.

Creating new things to solve problems and improve life depends on the close interaction of which two fields?

Abiology teacher asks students to give examples of genetic variations that support the idea that changes in a population’s environment affect genetic variation. which is the least supportive example? a. changes in genetics in human populationsb. antibiotic resistance in bacteria populationsc. pesticide resistance in garden insectsd. changes in the color of the peppered moth population in england