"<span>Medical advances have contributed to the increase in world population." Is the answer you are looking for this is the only correct answer because now that there are medical advances more people are having children and the infant mortality rate is significantly lower than before modern medicine. </span>
They are from bacteria that were not digested. Mitochondria are thought to have arisen from aerobic bacteria, and chloroplasts from photosynthetic bacteria. This explains their double membrane and own chromosomes.
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Explanation:
The stalk supporting a single flower is called a pedicel, that supporting an inflorescence, or an isolated flower, a peduncle. Anther: The pollen-bearing body of the stamen, usually relatively compact, and supported at the end of the narrow filament.
