Answers D
Mucous is used to protect and heal and also help expel harmful bacteria from the body.
<span>The option that best describes their heart rates during this activity is A. low. They aren't doing much at that particluar moment - they are just walking around, talking and laughing. There isn't much there to rise their blood pressure and thus heart rate, which remains low. Moderate, vigorous, and dangerous heart rates would require much more vigorous activities. </span>
A strong scientific ability or aptitude is an example A. human
