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jeka94
4 years ago
6

PLEASE HELP ASAP IM TIMED!! 100 PTS WILL GIVE BRAINLIEST TO WHOEVER ANSWERS FIRST AND CORRECTLY

Biology
1 answer:
cestrela7 [59]4 years ago
8 0

Answer: More than 99 percent of all organisms that have ever lived on Earth are extinct. As new species evolve to fit ever changing ecological niches, older species fade away. But the rate of extinction is far from constant. At least a handful of times in the last 500 million years, 75 to more than 90 percent of all species on Earth have disappeared in a geological blink of an eye in catastrophes we call mass extinctions.

Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. The most studied mass extinction, which marked the boundary between the Cretaceous and Paleogene periods about 66 million years ago, killed off the nonavian dinosaurs and made room for mammals and birds to rapidly diversify

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The cell of amoeba is shaped differently than the classical round or boxy shape seen in textbooks.

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Amoebas are unicellular organisms i.e consisting of a single cell. The amoebic cell can change its shape due to pseudopods. Pseudopods are structures in the amoeba that allow movement of the cell as well as help the amoeba to trap food by engulfing the particles. The species of amoeba are differentiated based on pseudopods. Amoeba also possess contractile vacuoles that helps it to get rid of the extra water.

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