One of the reasons for the success of the smallpox eradication campaign was that small pox only occurred in humans. Smallpox is an extremely contagious and deadly virus for which there is no known cure. it is caused by two variants, Variola major and Variola minor. it is a disease of the past that was eliminated by worldwide vaccination.
C is the answer
:) for your question (im writing extra cause answer is too small)
D a medium sized star because the largest star is canis majoris and the smallest star is brown dwarf..☺
Starfish has a endoskeleton
a coral has a exoskeleton
sponge has neither