The respiratory system regulates oxygen flow, and provides regulation for oxygen blood content. Circulatory system plays a roll in providing enough oxygenated blood to the body
Answer: 1.chromosomes, 2. Histones, 3. prokaryotes have one chromosome, 4. A sugar phosphate backbone with nitogen bases in the middle. 5. Chromatin
Explanation: Chromatin
D: a nucleus
the prokaryote cell has no nucleus and for that matter no other membrane bound organelle
There is proof of millions of other galaxies, and there is hope for other life, but there is no real knowing of other life in any other galaxy than ours.
The art of making and studying maps. Hopefully this helps.