A scientist finds the charred remains of a tree in a layer of volcanic ash thought to be from the eruption of Mt. Mazama some 6600 years ago. Which radioactive isotope, U-238 or C-14, would you use to verify the age of the charred wood? Expain.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time