When replicating dna, what enzyme uncoils the dna molecule?

Anton created a chart listing different types of materials. which best complete the chart?

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

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%