A species is considered endangered if it a. lives in an area that has been impacted by many invasive species
b. lives in an area that is legally protected from harmful human activities
c. has been identified as part of the Convention on Biological Diversity
d. has so few individual survivors that the species could soon become extinct
e. is not reproducing as quickly as members of its population are harvested

d. has so few individual survivors that the species could soon become extinct

Explanation:

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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.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.