Asingle motor neuron and the population of muscle fibers that it innervates is called a(n):

Motor unit

Explanation: Motor unit is a term used to describe a single motor neuron innervating the fibers of skeletal muscles. The axon endings of this motor neuron is in contact with the muscle fibers. The fibers in the motor unit are all of the same kind, but the number can vary from muscle to muscle. Activation of the motor unit causes contraction of the muscle fibers.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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pls mark as brainliest

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.