A hygrometer uses hair to measure O A. humidity
B. wind direction
O c. barometric pressure
O D. temperature

Humidity

Explanation:

Strands of hair can relax and lengthen when the humidity increases, and then contract again when the humidity decreases. In fact, the rate of change in the length of hair strands is so dependable that they can actually be used as the basis for a hygrometer, a device that measures the humidity level in the air

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

i think its through the fallopian tube