One of the main functions of vitamins is to
a. in chemical reactions in the body.
b. manufacture amino acids.
c. directly provide you with energy
d. directly provide you with the raw materials of which your cells are made.

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems