What is a limitation of using electron microscopes to view specimens?
a)electron microscopes cannot view living things.
b) electron microscopes cannot view internal parts of specimens,
c) the resolution of electron microscopes is weak and cannot view details of specimens.
d) you cannot view transparent specimens because of the microscope's low resolution.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

it's not c. i took the quiz and got it wrong. so my best guess is b.

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