When women experience cravings for different foods, it means that they experiencing a hormone related change which severely effects their sense of taste and other senses that can cause these kinds of cravings.
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The stimuli plants respond to will be found in the environment. Example....plants grow towars the sun.
They swam faster and learned to hide
Covalent bonds are formed when two non metal atoms share an electron. The atoms either give up or gain an electron, due to the outer shell being unstable.
Species A and B would be the most similar because there is only one mutation between the two of them located in the first codon.