Pteridophytes meaning​

(Pteridophyta) of vascular plants (such as a fern) that have roots, stems, and leaves but lack flowers or seeds

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A member of the  Pteridophyt

Explanation:

a division of plants including  ferns and their allies.

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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.