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
<span>They have various isomer structures often either open chain or cyclic isomers that readily interchange structures. </span>
Answer:
Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound.
Explanation:
The minimum pH is 4 whereas the maximum pH is 14. The optimum pH of enzyme Y is about 9.
The minimum pH is 4 whereas the maximum pH is 14. Within this range, Enzyme Y will work.
As shown in the graph, as the pH increases so does the rate of Enzyme action. The optimum pH of enzyme Y is about 9. The rate of enzyme action increase till a pH of 9, then it begins to decrease.
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<span>radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.
hope it helps M8
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