Explain the relationship between the environment, variation, and selection.
can cause certain traits to be favored through
Changing
This can lead to changes in
DONE

The relationship between environment, variation and selection lay the foundation for natural selection and evolution.

Explanation:

Genetic variations are present among species due to number of reasons like recombination or crossing over during meiosis, mutations, random fertilization etc. These factors bring changes among the members of a species. Some of the species become better adapted to survive in a particular environment whereas some are not better adapted and become extinct over a period of time. The environment selects the organisms that are best adapted to survive and hence lead to variations.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

sex cells are usually half's then they find another half and make a fertilize egg