What type of mutation causes sickle-cell anemia?

a) deletion

b) insertion

c) frame shift

d) substitution

Write a paragraph at least 5 sentences “why all vaccinations should be mandatory”

In "the pig," what is the main effect that the piglet initially has on kibuka?

If a cell is placed into a hypertonic environment,what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge