Which of external structure directly impacts the effectiveness of the host immune system

Capsule

Explanation:

The external structure that directly impacts the effectiveness of the host immune system is the capsule.

The capsule is known to be bad for the immune system of the host as it enhances the bacteria's ability to cause disease to the host organism. This they do through the prevention of phagocytosis. With the help of the capsule, th defense of the host organism can therefore be evaded easily.

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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.