Galaxies are systems of stars, gases, and dust that exist in a wide variety of shapes and sizes. The simplest classification scheme devised by Edwin Hubble recognizes four basic types of galaxies; elliptical, spiral, barred spiral, and irregular. Identify the shape of Earth’s galaxy. A) Spiral B) Lenticular C) Elliptical D) Irregular

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.

Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***

Genes that come together with different alleles are heterozygous. homozygous. genotype. segregated.