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.

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.
Chloroplast are an organelle in the plant cell that converts sunlight into energy and uses it for the growth of it.
It stores extra water for later use.
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the last one, oceanic crust is more dense!
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