Within a DNA molecule, which nitrogen base pairs with cytosine (C)?
A. uracil (U)
B. thymine (T)
C. adenine (A)
D. guanine (G)

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous