Why is the oceanic crust more dense than the continental crust? A. It’s made of iron and magnesium
B. its made of iron and nickel
C. Its made of iron and lead
D. It’s made of iron and silicone

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

The mitochondrion functions lipid storage protein synthesis photosynthesis dna replication atp synthesis

How can you tell the difference between rough er from smooth er?