To determine the effect of color of light on plant growth, 4 groups of bean plants were grown under the light conditions below.
group 1—under red light group 2—under green light
group 3—under violet light group 4—in normal, white light
which of the variables below should be held constant?
options:
the color of light each group of plants receives
all of the above
how much each plant grows
the amount of light each group of plants receives

D. The amount of light each group of plants receives

Explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation: