Which of the following best describes how deforestation would affect the oxygen cycle?

a. deforestation would result in less carbon dioxide in the atmosphere.

b. deforestation would result in less oxygen gas in the atmosphere.

c. deforestation would result in more water vapor in the atmosphere.

d. deforestation would result in less nitrogen in the soil.

Isolated volcanic peaks on the ocean floor are

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.