Introductory Sentence: 'The Cretaceous-Paleogene (K-Pg) extinction event wiped out approximately 75% of all plant and animal species on Earth.'

Which

Question

Introductory Sentence: 'The Cretaceous-Paleogene (K-Pg) extinction event wiped out approximately 75% of all plant and animal species on Earth.'

Which option compiles the THREE primary scientific findings regarding this extinction?

Accepted Answer

1) A six-mile-wide chondritic asteroid impact at Chicxulub ejected sulfur and soot into the stratosphere, blocking sunlight and halting global photosynthesis; 2) Prolonged impact winter and catastrophic collapse of marine phytoplankton precipitated the collapse of terrestrial and oceanic food webs; 3) Non-avian dinosaurs, pterosaurs, and ammonites vanished, allowing surviving small mammals and avian dinosaurs to undergo adaptive radiation.

Answer

1) A tyrannosaurus skeleton was discovered in Montana; 2) Asteroids contain stone; 3) Small birds eat worms.

Answer

1) Dinosaurs died because volcanic ash smelled bad; 2) Mammals grew wings and flew to South America; 3) Marine plankton became immortal.

Answer

1) The asteroid struck the moon instead of Earth; 2) Photosynthesis increased tenfold after the impact; 3) All mammalian species went completely extinct.

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