Which of the following periods is the earliest during which animals may have appeared?Question 14Select one:a.Cambrian periodb.Ordovician periodc.Cryogenian periodd.Ediacaran period

The first animals likely arose from aquatic protists called ______ about 570 million years ago.Multiple choice question.diatomsamoebaschoanoflagellatesdinoflagellates

Match the era on the left with its characteristic on the right.PrecambrianCenozoicPaleozoicMesozoic?When Earth formed?The age of dinosaurs?When most of our limestone and coal formed?The era of humans

A mass extinction event occurred about 542 mya that marks the boundary between Precambrian time and the A. Cambrian Period B. Hadean Period C. Permian Period

The Cambrian explosion refers toGroup of answer choicesan ancient mass extinction eventthe origin of prokaryotesthe origin of eukaryotesthe invasion of the landthe sudden appearance of animals

During the Precambrian period, the Earth's crust formed, and life_____in the seas. *10 poinfirst appearedthe first to appearthe first appearanceapprearing first