Why is growth hormone not a tropic hormone?

Tropic hormones are hormones produced and secreted by the anterior pituitary, which target endocrine glands (eg Thyroid stimulating hormones, Luteinizing hormones.
Non-tropic hormones are hormones that directly stimulate target cells to induce effects. This is different from the tropic hormones in that tropic hormones bind a receptor on another endocrine gland.

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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.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.