hormones enter target cells and bind to intracellular receptors, whereas hormones bind to cell membrane receptors and never enter the target cells.

i)Steroid

ii) Non steroid

Explanation:

i)Steroid Hormone : entry of hormone into target cell,binding to and activation of intracellular consequence.

ii) Non steroid : these hormone activate cell surface receptors and coupled second messenger system, with a variety of intracellular consequences.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

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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.