1. A radioisotope has a half-life of 1 hour. If a sample initially contains 100mg of this isotope, which one of the following correctly gives the amount of the radioisotope
remaining after 2 hours have passed? (1 point)

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