Why is water a more hospitable environment for life than dry land?
a. gravity is not a problem in water
b. sperm can meet egg easily in water
c. osmotic balance is not a problem in water
d. oxygen is more available in water
e. a and b are correct

Match each medication with its description.

Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.

If a young male's body is just beginning the process of producing sperm, when is it likely that he would ejaculate mature, viable sperm"