Cyanobacteria are important to the evolution and advancements of other life on earth because they a) were the first lifeform on earth. b) produced oxygen from photosynthesis. c) were the first group of organisms to leave a fossil record. d) were thought to have become mitochondria in the cells of animals.

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!

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

Isotopes of the same element have differ in their