In which of the following processes will substances move from areas of lower concentration to areas of higher concentration?
a. facilitated diffusion
b. diffusion
c. active transport
d. osmosis

Which substances have the lowest melting points: ionic covalent, or metallic

Liv sheldon given the balanced equation for an organic reaction: c2h2 + 2cl2 → c2h2cl4 this reaction is best classified as *

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.