The manner in which the terrestrial planets formed was the...

A gravitational condensation of hydrogen, helium, and dust in eddies or vortices in the solar nebula.

B gravitational condensation of gas, followed by the capture of solid planetesimals.

C accretion of solid planetesimals containing mostly rocky material.

D accretion of planetesimals to form a core, followed by the gravitational capture of gas from the solar nebula.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.