Which term describes the difference in the concentrations of a substance across a cell's membrane?

a. Diffusion membrane

b. Concentration membrane

c. Concentration gradient

d. molcular concentration

1. Having spent much time in sunlight during youth, an older person develops skin cancer and has the growths removed. What environmental mutagen causes the growths to keep coming back AND why might the growths keep coming back? 2.

Which of these represents the female gametophyte generation of an angiosperm? A. an embryo sacB. an ovule C. an ovary

Mary's doctor says that her inactive lifestyle has put her at risk of becoming obese. What else might Mary be facing if she continues to be inactive?

How are proteins associated with glycolysis?

20 Pts! Place the following events in chronological order: a. The first cells appeared that could make their own food from sunlight. b. The ozone layer was formed. c. Simple chemicals reacted to form new molecules. d. Animals appeared. e.

A substance directly involved in cellular communication within the human body

Scientists try to predict the location of major earthquakes based on which of the following? location of fault zones location of a mountain location of an ocean location of the science lab

What Are The Branches Of Botany?

Rocks, temperature, and water ARE what part of the environment

Georges Cuvier's discovery of fossils of Irish elk and giant ground sloth: