Contrast Proterozoic and Phanerozoic Eons.(1 point) Responses Proterozoic eon animals were single cells or more primitive, and the Earth was just forming. Phanerozoic eon animals were multicellular and complex, Earth had formed continents, and continental drift was beginning to happen. Proterozoic eon animals were single cells or more primitive, and the Earth was just forming. Phanerozoic eon animals were multicellular and complex, Earth had formed continents, and continental drift was beginning to happen. Proterozoic eon animals did not exist, and the Earth had only the Pangaea supercontinent. Phanerozoic eon animals began when dinosaurs developed, Earth had formed continents, and continental drift was beginning to happen. Proterozoic eon animals did not exist, and the Earth had only the Pangaea supercontinent. Phanerozoic eon animals began when dinosaurs developed, Earth had formed continents, and continental drift was beginning to happen. Phanerozoic eon animals were single cells or more primitive, and the Earth was just forming. Protozoic eon animals were multicellular and complex, Earth had formed continents, and continental drift was beginning to happen. Phanerozoic eon animals were single cells or more primitive, and the Earth was just forming. Protozoic eon animals were multicellular and complex, Earth had formed continents, and continental drift was beginning to happen. Proterozoic eon animals were fish, amphibian, and reptiles living on Pangaea. Phanerozoic eon animals were mammals, and Earth had formed Laurasia and Gondwana continents.

Answer 1

The correct contrast between the Proterozoic and Phanerozoic Eons can be summarized as follows:

1. Proterozoic Eon: This eon primarily featured simple, single-celled organisms and less complex multicellular life. The Earth's crust was still stabilizing, and no major landforms like continents as we know them today were fully developed. The Proterozoic spanned from about 2.5 billion to 541 million years ago, preceding the advent of more complex life.

2. Phanerozoic Eon: This eon, which began around 541 million years ago, is characterized by an abundance of complex, multicellular life forms, including plants, animals, and fungi. During this time, significant geological developments occurred, including the formation of continents and the process of continental drift. The Phanerozoic is divided into three eras: Paleozoic, Mesozoic (age of dinosaurs), and Cenozoic (age of mammals).

Therefore, a suitable correct response among the options would be:

"Proterozoic eon animals were single cells or more primitive, and the Earth was just forming. Phanerozoic eon animals were multicellular and complex, Earth had formed continents, and continental drift was beginning to happen."

(Note: The repetition in the response options provided seems to indicate a possible error in formatting or transcription, but the fundamental contrast highlighted above remains accurate.)