The non-living factors in an ecosystem are called . A. Solid
B. Biotic
C. Abiotic
D. Dead

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.

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic