Question 5

from where do scientists think the water on earth might have come?

water vapor came out of volcanoes

collisions of comets released water

violent storms created by dust particles

collision of earth with stars

What happens when the cell copies its chromosomes

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna