Which characteristic contributes to the quick nutrient cycling in tropical rain forests? a. evergreen leaf litter b. deep, fertile soil c. heat and high humidity d. cold temperatures

heats and high humidity

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

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.