Explain why decomposers are an important part of a food chain.

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? )

When water freezes, it . contracts expands

Can a trait be both polygenic and have multiple alleles? explain why or why not.