It is common to find calves on farms that are conceived through in order to control paternity and avoid the complications of natural breeding. A. many ways
B. artificial insemination
C. natural conception
D. natural treatment ​

The impact of a large asteroid comet with earth has been proposed to have caused the extinction of the dinosaurs. the impact site of this comet is in or near

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called