Air masses that originate in Canada are:

a. continental tropical

b. maritime tropical

c. maritime polar

d. continental polar

Explain why a signal cascade can be useful in certain cell processes

Which of the following is not an example of an abiotic factor? a. plants b. air c. temperature d. soil

Lindeman developed a classification of organisms based on

Which of the following is an example of an adaptation? A dog sits when it hears a a command because it's owner rewards it with food B. The coloring of a monarch butterfly alerts predators to the fact that the butterfly is poisonous. C.

How is mitosis different from meiosis

Water has a higher specific heat index than other common materials, so it takes a lot of energy to raise the temperature of water. How would this affect climate? A) Areas surrounded by water would have more snow.

Is pH=2 an acid, a base, or neutral

After one species disappears, the other species in the ecosystem

The level of which hormone increases after ovulation

What does sodium-potassium pump do?