Which water depth had the biggest difference in survival rates for embryos with uv-b protection versus embryos without uv-b protection? (a) 0 cm(b) 100 cm(c) 50 cm(d) 10 cm

10 cm

Explanation:

The water at 10 cm has the biggest survival rate for the embryos with ultraviolet B protection as compared to that of embryo which are not protected by UV-B.

Ultraviolet rays can be very harmful as it can reach the fetus but due to some particles present in water the intensity of UV-B becomes attenuated below 10 cm of water.

So, the correct answer is 10 cm.

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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.