HOW does the article develop the idea that
scientists have made progress treating viral illnesses?
by showing how many viruses there are, and explaining which diseases have vaccines
B
by explaining the origin of early vaccines, and describing how antivirals work
C by describing the characteristics of viruses, and explaining how they infect hosts
D
by providing an example of an early scientist,
and describing the role of antibiotics

gas

explanation:

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smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

i think   the answer is c hope i'm right