Fertilization usually occurs in the

a. fallopian tubes.
b. ovaries.
c. uterus.
d. vagina.

What is the difference between an igneous, sedimentary and metamorphic rock

What's the waste product of electrons and pyruvate combining in fermentation?  

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna