1. What kinds of evidence can be used to show that a supercontinent once existed?

1 answer:

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1. the continents seemed to be put together like a jigsaw puzzle also the evidence of tectonic plates moving in our crust

2. Continental drift was a theory that explained how continents sift position on earth's surface

3. one of the issues with the theory that geologist at the time had, was that Wegener was not a geologist. He was publishing a theory that wasn't associated with his field of science. The other issue the geologists had was based on the commonly held opinion

4. Continents move about the earth like huge ships at sea, floating on pieces of the earth's outer skin, or crust. New crust is created as melted rock pushes up from inside the planet. Old crust is destroyed as it moves toward the hot rock and melts.

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in humans, a combination of XX chromosomes results in a female zygote and that of XY result in a male zygotes. From whom does th

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The answer is: from mother

In a human diploid somatic cell (2n), there are<span> in total 46 chromosomes</span> - 22 autosomal chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes. In males, there is one X and one Y chromosome (XY) while in females, there are two XX chromosomes (XY).
During the formation of gametes, a female could give only X chromosomes, so gametes from the mother contain one X chromosome. But, a male could give X or Y chromosome, so gametes from the father contain either X or Y chromosome.
Female gamete and male gamete fuse to form a zygote. Male zygote must contain both X and Y chromosome. It inherits Y chromosome only from the father, so X chromosome must be inherited from the mother.

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Answer:

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