B. Chromosomal abnormality
Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
If your pertaining to reps it would be 2 or more as my guess.
That would be true, this is all part of a good diet
I dont see the statements, if you could comment I would be able to help you.