Which is the most proper order of most simple to most complex?
A. cells, populations, organisms, ecosystem
B. organisms, populations, ecosystem, cells
C. cells, populations, ecosystem, organisms
D. cells, organisms, populations, ecosystem

Question

Which is the most proper order of most simple to most complex? 
	A.	cells, populations, organisms, ecosystem
	B.	organisms, populations, ecosystem, cells
	C.	cells, populations, ecosystem, organisms
	D.	cells, organisms, populations, ecosystem

anonymous · Answer

D. cells, organisms, populations, ecosystem. 
Cells make up organisms, organisms make up populations, populations make up ecosystems.