Mice engineered to express both ras and myc constitutively in mammary epithelial cells
a. developed breast cancer soon after birth, because the combination of ras and myc is sufficient to cause cancer in animals
b. were indistinguishable from wild type mice
c. developed breast cancer, but only after a lag during which p53 was also lost
d. developed breast cancer, but only when they reached sexual maturit

it would be heredity

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101