Amotor unit is
a. one motor neuron
b. one motor neuron and the group of muscle fibers it innervates
c. several motor neurons and the group of muscle fibers it innervates
d. one motor neuron and only one muscle fiber

one motor neuron and the group of muscle fibers it innervates.

Explanation:

The concept of motor unit was given by Charles Scoot. A motor unit work together in a group and result in the coordination of a single muscle.

A motor unit is made upof a motor neuron and the skeletal muscle fibers that innervates the motor neuron. The motor unit consists of same muscle fibers.

Hence, the correct answer is option (b).

C

Explanation:

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a

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the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.