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

A sedimentary rock containing a fossilized sea shell had been found. What does this tell you about the area at the time the rock was formed? A. The area was under water. B. The area was cold. C. The area was muddy and wet. D.

Water is the most abundant molecule found in living organisms. Most mammals, in fact, are approximately 70% water by weight. About 2/3 of this water is present inside cells. The other 1/3 is present outside cells (e.

Inside the lungs air gets warmer and wetter. How else does it change?

Adding fertilizer to most aquatic systems results in

What is the surface area of a cube with a side length of 18 meters? a. 108 m2 b. 5832 m2 c. 324 m2 d. 1944 m2

Most destruction in an earthquake is caused by - waves

Which macromolecule includes steroids? a. lipids b. proteins c. carbohydrates d. nucleic acids?

The diploid cell created by the joining of conifer sex cells produces a (n): a. Zygote c. Bryophyte b. Megaspore d. Angiosperm

Which is a leading theory for the formation of fossil fuels?

Allele segregation and gamete formation one character in peas that mendel studied was yellow versus green seeds.