What drives most of the water within xylem vessels to move toward the top of a tree?

a. the force of root pressure

b. atmospheric pressure on roots

c. active transport of ions into the stele

d. evaporation of water through stoma

e. osmosis in the root?

How many chromatids are in each replicated chromosome

Ponds are smaller and than lakes.

Why is cellular respiration important to all animals

Define and explain what a pure culture is

What is a second messenger? A. A substance that reacts with a first messenger. B. A small substance generated in response to receptor binding that activate or inactivate specific proteins. C. A substance that reacts with a hormone or other ligand D.

How is evolution seen today

What was Marshall Nirenberg and Heinrich Matthaei's contribution to our current understanding of the genetic code? discovery of codons discovery and extraction of DNA creation of a model of DNA creation of Photo 51

How does pili affect the formation of bacterial colonies?

Cancer viruses transform cells by integrating themselves into what part of the host cell?

What is a linnet squar