Which protein serves as a chemical messenger?
hemoglobin
actin
myosin
insulin

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

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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.