Question

compare the important events on the geologic time scale. which statements are true? select the proper radio buttons to indicate your choices. there was no life present during the hadean eon. complex animals such as dinosaurs appeared in the archean eon. fossils from the proterozoic eon are more complex than fossils from the phanerozoic eon. a collision in the late mesozoic era contributed to dinosaur extinction. the oldest and simplest organisms are from the archean eon. check answer remaining attempts : 3

Explanation:

1. "There was no life present during the Hadean eon.": The Hadean eon was very early in Earth's history, with harsh conditions (like intense volcanic activity, no stable crust initially), and no life is known to have existed then. So this is True.
2. "Complex animals such as dinosaurs appeared in the Archean eon.": The Archean eon had simple life forms (like prokaryotes). Dinosaurs appeared in the Mesozoic era, much later. So this is False.
3. "Fossils from the Proterozoic eon are more complex than fossils from the Phanerozoic eon.": The Phanerozoic eon has complex life (like vertebrates, flowering plants), while Proterozoic had more complex than Archean but less than Phanerozoic. So this is False.
4. "A collision in the late Mesozoic era contributed to dinosaur extinction.": The Cretaceous - Paleogene (K - Pg) extinction event, likely due to an asteroid collision, caused dinosaur extinction at the end of the Mesozoic. So this is True.
5. "The oldest and simplest organisms are from the Archean eon.": The oldest known life - like structures (microbial) are from the Archean, and they are simple (prokaryotic). So this is True.

Answer:

• "There was no life present during the Hadean eon.": True
• "Complex animals such as dinosaurs appeared in the Archean eon.": False
• "Fossils from the Proterozoic eon are more complex than fossils from the Phanerozoic eon.": False
• "A collision in the late Mesozoic era contributed to dinosaur extinction.": True
• "The oldest and simplest organisms are from the Archean eon.": True