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

How do high-energy electrons from glycolysis and the krebs cycle contribute to the formation of atp from adp in the electron transport chain? a. high-energy electrons interact with pyruvic acid to create a phosphate bond with adp, forming atp. b. high-energy electrons supply the needed energy to synthesize atp from the lower-energy adp in the electron transport chain. c. high-energy electrons supply a negative charge which causes the citric acid to oxidize, forming a phosphate group to bond with adp. d. high-energy electrons increase the temperature of adp so it easily reacts to form atp.