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.
Genetic data suggests many frog species that live in Madagascar and India share a common ancestor that lived on the India-Madagascar landmass is best described by
(b)Geographic separation led to divergence in the gene pool, resulting in a new species
Explanation:
- The island's geography, geology, and climate have provided opportunities for species to evolve and diversify in isolation. Its species are a mix of those that have been living and evolving there for many tens of millions of years and those that arrived more recently and subsequently diversified.
- Some of Madagascar's present species are there because they "rode there" on the continents and were left on the island when it separated from India.
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