We have polluted it— the air, water and the ground.
Some people have tried to clean up the environment
The statement which explains why muscle cells and skin cells do not look and act the same is this: THE GENES IN EACH TYPE OF CELL ARE BEEN EXPRESSED DIFFERENTLY.
All the cells in human's body has the same set of genes, this is because, all the cells in the body originated from a single fertilized egg. Even though all the cells in the body has the same origin, they are different from one another because, the cells use the same set of genes differently.
The layers above would be not as old and the layers below would be the older layers.
Explanation:
I'll try to help what is the question
Cellular organizations
reproduction
metabolism
homeostasis
heredity
response to stimuli
growth and development
adaptation through evolution
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