What problem may have caused the vikings to stop coming to north america?
a) battles with native americans
b) lack of food
c) inability to build houses
d) bad weather

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

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