This amniotic egg contains the nutrients that the growing embryo needs to develop correctly. which of the following is an essential element for all living things that is found in the yolk sac?
a. phosphorus
b. chlorine
c. silver
d. radon

When does dna replication(make a copy of itself)?

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time