Answer:
physiography originally means the study of nature . but here it means physical geography
Explanation:
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Answer:
Explanation:
The fossil record
This supports Darwin's theory of evolution, which states that simple life forms gradually evolved into more complex ones. Evidence for early forms of life comes from fossils. By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth.
This is referring to meiosis, which happens just once to make reproductive cells, unlike mitosis which is just simple copying.
In mitosis, one cell splits into two, but the number of chromosomes doesn't change. The original cell makes two copies of its chromosomes and divides them up.
![\boxed{(2n\rightarrow\ 2n)}](https://tex.z-dn.net/?f=%5Cboxed%7B%282n%5Crightarrow%5C%202n%29%7D)
In <em>meiosis</em>, however, our cell doesn't bother making those two copies. It just takes what it has and divides it between two new cells.