D: of how social issues affect the spread of disease
Answer:
Frogs must keep their skin moist. Otherwise, oxygen can't pass easily through it and the frog suffocates.
Conception occurs when the male gamete fertilizes the female gamete.
The paralysis of the cilia that line the
airways is very harmful to one’s health. As you may know, the cilia
protect the nose from breathing in particles, such as dust and soot, mold, fungi,
bacteria, and viruses. If the cilia<span> no longer effectively remove mucus, an individual
must cough it up</span>. If this continues, a person may develop a serious
cough.
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A molecule is two or more atoms bonded together chemically. An atom is the most basic unit of matter. When atoms are chemically bonded together with covalent bonds, molecules are formed. Molecules can be very small like water molecules or extremely large like proteins such as hemoglobin.
