Lower case "P" stands for negative common, (base ten) "H" stands for element hydrogen, and D stands for doctor
<em>The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.</em>
Answer:
c
Explanation:
Jen should learn to trust and respect all of Ryan's friendships
Infants can sit with support when they're approximately six months old.