Echolocation is an adaptation bats use to
a. hunt insects in flight
b. locate flowering plants
c. find warm places for hibernation
d. all of the above

What is a traditional chinese touch therapy involving finger pressure applied to specific areas of the body to restore the flow of qi.

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d