Polymers are formed by joining several units called monomers. what does the term monomer refer to?
the answers are
a unit made up of several compounds
a unit made of several atoms
a unit made of several molecules

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? )

Depending on the organism the number of in a cell may change

According to the cladogram, which organisms have roundworms as a common ancestor?