Which best describes a theory?
a. an educated guess
b. an untested claim
c. a well supported conclusion
d. a proven fact

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

The response is the basis for vaccination. primary secondary tertiary none of the above

What causes darkening of the skin as melanin production increases