As life began to populate earth's surface, what change was seen in the atmosphere?

A. more oxygen was consumed

B. more carbon dioxide was added

C. more carbon dioxide was consumed

D. more oxygen was added

How and where is nectar unloaded by foragers upon their return to the hive? a. by trophallaxis with receiver bee; b. near hive entrance direct regurgitation into nectar cell; c. upper area of wax comb direct regurgitation into nectar cell; d.

Which interaction of the atmosphere with the lithosphere benefits the biosphere

Question: 12 of 15 > Save & Exit fpt Using a microscope, a student observes bacterial cells on two different prepared slides. The student notices that the cells on one side are spherical and the other cells are spiral-shaped.

In the human body, which of the following is considered an external defense in the prevention of disease? Mucous Histamines Antibodies Fever

How can the location of a fossil reveal its age? Explain your answers

Beethovens final symphony no. 9 was the first symphony to ever use what?

How do elements reach stability?

Is there a difference between the theoretical probability of a child being affected by an autosomal recessive disease carried by both of her parents (as in Question 1), and the fraction of affected children you observe when generating a random

Explain how temperature can bring about changes in the state of matter.

The species name for the red maple is?