What kind of vector is usually used in gene therapy to deliver functional, normal genes to diseased cells? a. A bacterium
b. A virus
c. A healthy body cell
d. An egg cell

When does dna replication(make a copy of itself)?

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior