Each organism in a population produces more offspring than can survive. This is called .

In order for natural selection to occur, populations must have .

When the environment changes, nature selects favorable . Over time, these in a population.

Each organism in a population produces more offspring than can survive. This is called overproduction.

In order for natural selection to occur, populations must have variation

When the environment changes, nature selects favorable adaptions. Over time, these build up in a population.

Explanation:

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halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).