Some species of plants that grow best in shade are used in an experiment. the plant species are divided into control groups and experimental groups. all groups are grown under identical conditions except that the experimental groups are given daily doses of direct sunlight. at the end of one month the growth of the control and experimental groups is compared.

which of the following is the most likely hypothesis for the experiment described above?

a. vegetation that grows in shady areas requires more water than vegetation in non-shady areas.
b. direct sunlight causes the soil to have more space for vegetation.
c.
vegetation near shaded areas requires more direct sunlight than offered.
d. direct sunlight affects some types of vegetation that grow best in shady areas.

answer !