PLEASE HELP 2 POINTS EACH SO IF YOU ANSWER ALL IN CORRECT FORMAT YOU WILL GET BRAINLIEST PLEASE DO BC IM SO STRESSED THAT IM LEGIT CRYING 1. In 2-3 sentences, identify two possible causes of the largest mass extinction in Earth's history and explain how it was beneficial to some species.

2. In 2-3 sentences, explain how patterns of early development support the Theory of Evolution.

3. What is the common ancestor of crocodiles and turtles?

What is the common ancestor of mammals and turtles?

4. In 3-5 complete sentences, detail Darwin's observations on the Galapagos that led to his Theory of Evolution.

5. In 5-7 sentences, briefly define evolution and natural selection then analyze the differences between the two concepts.

Fossils that are abundant in earlier rock layers are simply not present in later rock layers. A wide range of animals and plants suddenly died out, from tiny marine organisms to large dinosaurs.

Species go extinct all the time. Scientists estimate that at least 99.9 percent of all species of plants and animals that ever lived are now extinct. So the demise of dinosaurs like T. rex and Triceratops some 65 million years ago wouldn't be especially noteworthy—except for the fact that around 50 percent of all plants and animals alive at the same time also died out in what scientists call a mass extinction.

Explanation:

a- all cells come from pre-existing cells

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides