Lactic acid build up in muscles is a sign that

a. aerobic respiration capacity has not been reached

b. respiration is operating effectively

c. insufficient oxygen is reaching the muscles

d. the muscles will be able to operate continuously for a long time

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.

What processes take place before the mature mrna exits the nucleus?

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?