Greenhouses are buildings that are made out of transparent (see-through) materials, such as glass. They are used to keep
plants at a comfortable temperature. They work by allowing
the heat of the sun in, and then trapping some of the heat
from escaping the building, keeping the temperature in the
greenhouse warm.

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:

answer: 45

explanationyou have to add as well to be it could be