D. They come from other living things
Explanation:
The cell theory states that all living things come from preexisting cells.
Answer:
You can ask a doctor to do a blood test
the blood type should be somewhere on the results
The frog heart<span> has 3 chambers: two atria and a single ventricle. The atrium receives deoxygenated blood from the blood vessels (veins) that drain the various organs of the body. The left atrium receives oxygenated blood from the lungs and skin (which also serves as a gas exchange organ in most amphibians).</span>
Well I believe that
aside from the big ones which are the DNA and RNA:
Some
proteins (such as telomerase) have bits of attached RNA. Ribosomes have a bit
of RNA. <span>
<span>We also have adenosine triphosphate, which is the energy koin
of the cell. </span></span>
