The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half-lives have elapsed since the material was 100% parent atoms? A Between 2 and 3
B More than 3
C Between 1 and 2
D Less than 1

Aplant may open end close its stomata to prevent excess water loss and maintain

What would most likely happen if a person increased the amount of saturated fat in his or her diet? the person's risk of cardiovascular disease would increase. the person's risk of cardiovascular disease would decrease. the person's bad cholesterol would decrease. the person’s good cholesterol would increase.

If it turned out dinosaurs were colorblind, how would this affect some assumptions scientists have made about them?