D. one year
7. which of the following is not a characteristic of topsoil?
a. it develops very slowly and is the most utilized part of soil
b. it makes up the top two to eight inches of soil
c. it is the most fertile part of the land for growing plants
d. it develops very quickly and is the most utilized part of soil

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

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Which of the following is not associated with invasive species?