from which structures do oxygen immediately enter the blood system ?

a. bronchi

b. veins

c. alveoli

d. nostrils

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

What must be done to breed dogs for a partical trait