What are the free radicals regulation during exercise?

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher