Answer:
Increase the reaction rate
Explanation:
Enzymes are organic substances that are produced to catalyse and speed up chemical reactions in chemical reactions. Enzymes take part in product formation. They lower the activation energy by acting as catalysts during a chemical reaction thus products are formed faster.
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Geologists have sorted earth’s history into different geologic time scale. They just clubbed it into time scales by observing the major changes in the life forms that existed on the earth. Inferring to the fossils found in rocks the time scale was calculated.
First era single cell animals were formed then formed the complex animals.Then Mesozoic era where it is known as the era of dinosaurs. Then the evolution of different species of life during Cenozoic era. These major changes found through fossils helped them to form the GTS.
Macrophages (histiocytes) - are phagocytes - these cells 'eat' particles such as bacteria. These cells are derived from white blood cells called monocytes (see the section on blood).
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Answer:
There is a great difference between light and scanning electron microscope. The source of illumination is light rays in light microscope while in scanning electron microscope electrons are the source of illumination.
The resolving and magnification power of scanning electron microscope is much greater than that of a light microscope. The magnifying power of a light microscope is 1000X and of electron microscope is 10,00,000X.
In light microscope image is seen through the eyepiece while in scanning electron microscope it is seen on a fluorescent screen. Even small specimens up to 0.1 micrometers can be seen by scanning electron microscope which is not possible to see by light microscope.
Geologists can often match up rock layers over distances.