All of the statements are true
Viruses are considered to be non living things because they do not meet many of the criteria that are needed for an organism to be considered a living thing.
Viruses can not replicate on their own, they do not excrete any waste and do not meet all the seven features that living things must exhibit.
I think the answer is evolution.
The myelin sheath covers most of the axon. It is important because it helps to protect the axon and speed up the neuron firing process by decreasing the amount of time in the axon.
Depending on the type of forest, they can.