Sex linkage. ... In mammals, the female is homogametic, with two X chromosomes (XX), while the male is the heterogametic sex, with one X and one Y chromosome (XY). Genes on the X or Y chromosome are called sex-linked.
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Charles Darwin was a naturalist from the 1800's. He developed the theory of natural selection which became the foundation of modern evolutionary studies. Natural selection is the survival and reproduction of individuals and how they adapt.
The digestive system and how to find out the symtoms
I believe A. binary fission
