A is the answer to this question
Answer:
All cells arise from pre existing cells.
Explanation:
one of the principles on the cell theory states that all cells came from pre existing cells . The two cells are parent cells who are big enough to undergo mitosis. The 4 cells made out of this event are daughter cells .
Uncontaminated. it allows researchers or forensics to compare it with another sample
False.
The semilunar valves are the pulmomic and aortic values.
the mitral and tricuspid valves prevent back flow of blood into the atria.
They decay. Anything that can grow will eventually start to decay over time. I hope this helps.
