It is part of the cell theory
Synthetic organic pigments are derived from coal tars and other petrochemicals. Inorganic pigments are made by relatively simple chemical reactions—notably oxidation—or are found naturally as earths. Inorganic pigments include white opaque pigments used to provide opacity and to lighten other colours.
It's called Biogeography which is the study of fossils, plants, species.
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The answer would be: relatively constant environmental conditions
When the environment condition is changed, the organism need to changes too. If the organism reproduced asexually, their genetic material of the offspring would be identical without change. This makes asexual reproduction couldn't produce a different offspring.
Sexual production will produce a various genetic material that might turn the changes into beneficial condition.