The digestive system breaks down the food we eat while the circulatory system transports the tiny particles to each cell in the body.
Phenotypes are the physical trait expressed while genotypes is the actual allele inherited. If we’re talking about blood types the genotypes of type A are Ai or AA, for B is Bi or BB, and for type O it is ii. I would need to see the table in order to fully answer your question. Let me know if you need anymore help. :)
Nitrogen dioxide is covalent, others are ionic. ;)
I think Phosphorus is a key component of the energy molecule ATP.
Cancer cells are cells gone wrong — in other words, they no longer respond to many of the signals that control cellular growth and death. Cancer cells originate within tissues and, as they grow and divide, they diverge ever further from normalcy. Over time, these cells become increasingly resistant to the controls that maintain normal tissue — and as a result, they divide more rapidly than their progenitors and become less dependent on signals from other cells. Cancer cells even evade programmed cell death, despite the fact that their multiple abnormalities would normally make them prime targets for apoptosis. In the late stages of cancer, cells break through normal tissue boundaries and metastasize (spread) to new sites in the body.