The brain is underdeveloped at birth and dovelops more over the firts few years.
True because you eat with your teeth which process food into the stomach
<span>The correct answer is D. The US Food and Drug Administration examines many different substances and approves them when their benefits outweigh the risks. To be approved, manufacturers must prove to the FDA that their product is both safe and effective, so if the drug is ineffective, it is unlikely that the FDA will approve it.</span>
It allows Nutrients and waste substances to pass through them
