History of Life on Earth

The study of the movement of the earth's crust is called _____. a. paleontology b. meteorology c. plate tectonics d. driftology

According to geochemists which of the following would have been the most unlikely condition on the primitive Earth?a. atmospheric coolingb. crust formationc. gas cloud encircling the Earthd. high levels of oxygene. water, carbon dioxide, and nitrogen among the early gases

The oldest fossils of eukaryotes have been estimated to bea. 6000 years oldb. 8 billion years oldc. 4.5 billion years oldd. 1.5 billion years olde. 1995 years old

Approximately how long ago did LIFE first evolve on eartha. 4.5 billion yearsb. 3.5 billion yearsc. 1 billion yearsd. 600 million yearse. 100,000 years

The primitive atmosphere had little if any _____.a. waterb. free oxygenc. carbon dioxided. nitrogen 

The time period during which life arose and the first cells came into existence is the _____.a. Jurassicb. Carboniferousc. Precambriand. Paleocene

When two continents collide a(n) _____ often forms.a. chain of volcanic islandsb. ocean trenchc. mountain ranged. ocean ridge