you've made the hypothesis that the less rainfall a cactus plant gets, the taller it will grow, since cactuses like dry conditions.
what should be the independent variable in an experiment designed to test this hypothesis?
a. the height of the cactus plants
b. the hours of sunlight the cactus plants get
c. the amount of rain falling on the cactus plants
d. the type of soil the cactus plants are growing in

Color blindness is a recessive trait. the gene for color blindness is on the x chromosome. the family tree below shows the trait of color blindness. the only unknown is the mother in the first generation

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?