Including the exosphere, how many layers does Earth's atmosphere have?
A. 3
B.8
C. 4
D.5

What are the four basic classes of organic molecules how do they differ structurally and functionally

Dna is colied into chromosomes in a cell

The idea that all living things are made up of cells is considered scientific law. this means the idea is an emerging scientific idea that has a logical explanation. has been tested with similar results at least twice. is supported by scientific consensus and a large amount of evidence. has been rejected only once by the scientific community