Answer:
Humans affect the environment in positive and negative ways. Cutting down trees and littering have a negative effect on animals and plants. Protecting endangered species and cleaning lakes and seas has a positive effect on the environment.
Several different mutations can cause the same genetic disease when we consider that t<span>he actual position of the mutation in the gene may vary but still result in a defective gene. For example, there are many mutations that can lead to cystic fibrosis. We can count up to more than one thousand different mutations that can lead to the same sickness. If chromosomes are affected while they are developing you can expect genetic diseases. </span>
1. the plant produces the seed
2.pollen fertilizes the female part or the plant
3.the squirrel collects the seed
4. the squirrel buries the seed
5. squirrel doesn't come back for seed
6. a new plant grows
Some neurons have a fatty layer covering called MYELIN SHEATH around their axon. This layer is not continuous and the gaps are called NODES OF RANVIER.
Because the myelin sheath is made up of insulating fatty substances, the nodes of ranvier allow the fast transmission of electrical impulses along the axon.
