Chromosomes condense before<span> mitosis to allow them the ability to move smoothly, without becoming entangled and breaking. (So, </span>they<span> are conveniently packaged for cell division, in which the </span>chromosomes<span> must move to both poles of the cell.) Because when </span>they<span> are un condensed- in chromatin form, </span>they<span>'re unwound.</span>
When the starfish were removed from the area as part of an experiment, the mussel population swelled and crowded out other species. The biodiversity of the ecosystem was drastically reduced. Payne's study showed that identifying and protecting keystone species can help preserve the population of many other species.
Answer:
b. Motor Unit
Explanation:
A motor unit is consist of motor neuron and muscles fibers connected through the axon terminal of neuron. Motor unit function for the movement (contraction and relaxation) of muscles.
A neuron is connected with muscles fiber through the axon terminal of neuron and is called neuromuscular junction. Skeletal muscle fiber is consist of a cylindrical muscle cell that contain microfibrils which participate in contraction and relaxation of muscles.
Neuron and muscle fiber coordinate with other other for the proper functioning of motor unit.
Hence, I selected diagram "b" that represents motor unit.
The awnser is b or c i think so