Answer:
During anaphase 2, the chromosomes' centromeres break, and the spindle fibers pull the chromatids apart. The two split portions of the cells are officially known as "sister chromosomes" at this point.
Explanation:
Blood flow will increase as blood vessels expand.
Answer:
Size and number.
Explanation:
Endurance training may be defined as the training used to endure and increase the muscles and makes individual fit and increases its endurance. The aerobic system of the body is trained in endurance training.
The endurance training creates various physiological changes in the individual organism. The size as well as the number of mitochondria increases in the endurance training. This increases the oxygen or aerobic activity of the body.
Thus, the correct answer is option (a).
Blood vessels goes up to your head and you need air for your lungs to breath
