Which two of the following are main ideas of the article?
1. carbon shifts from one area to others through the slow and fast carbon cycles.
2. when the ocean takes in more carbon than it releases, it becomes more acidic.
3. rain breaks down rocks, which are eventually brought to the ocean.
4. human behavior has led to increased carbon levels in the atmosphere.
question 3 options:

1 and 2

1 and 4

2 and 3

3 and 4

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.