Starting billions of years ago, algae lowered the

atmosphere.

levels in the

A. oxygen

B. ozone

C. carbon dioxide

D. methane

Which of the following is the first step in primary succession?

How topographic map and satellite mosg likely change over time?

What shows the movement of energy (in the form of food) from one organism to another?

Why does secondary succession happen more frequently than primary succession? secondary succession occurs in stable communities fewer disturbances and hence fewer changes happen in a community vegetation begins in a barren land where no life exists

Which simple machine is best used to split apart an object?

The type of protein-energy malnutrition characterized by a general lack of protein in the diet is called __. a. marasmus b. sickle cell anemia c. cystic fibrosis d. kwashiorkor

Which of the following best describes fallacies? A. Fallacies rely on incorrect inferences. B. All fallacies rely on overgeneralizing. C. Fallacies are also called pathological leaps. D. All advertisements rely upon fallacies.

The most worrisome results of the large-scale clearing and cultivation of land include

Where does iron man come from?

Which blood group is the worlds Rarest Blood grup