Where does diffusion of oxygen and carbon dioxide take place in the lungs?
a. alveoli and capillaries
b. bronchi and thorax
c. cilia and pleura
d. epiglottis and larynx

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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explanation:

plz give me the characteristics.