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
Answer: .D. Smaller because its smaller surface area to volume ratio would allow it to breathe sufficiently through its skin alone.
Explanation:
Answer:
Inner planets: Mercury, Venus, Earth, Mars
Outer planets: Jupiter, Saturn, Uranus, Neptune
They all orbit the sun, have a core, are round, and have gravity.
Jupiter vs. Venus: They both have reflective atmospheres. Jupiter is much larger and is a gas planet. Venus is smaller and has a rocky surface.
Explanation:
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