Which of the following adaptations is most effective in helping rain forest plants trap sunlight so that light energy can be converted to chemical energy? small seed size
small seed size

large root size
large root size

large leaf size
large leaf size

small stem

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

Which could be a pathway of food through an ecosystem

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.