Which choice correctly names the chambers of the heart?

a: upper ventricle, lower ventricle, upper atrium, lower atrium

b: right ventricle, lower ventricle, upper atrium, lower atrium

c: upper aorta, lower aorta, upper ventricle, lower ventricle

d: right atrium, left atrium, right ventricle, left ventricle

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

The potential to eradicate preventable diseases in the future depends on other societal factors that influence coordination and deployment of global health resources. for example, 70 confirmed cases of circulating vaccinederived poliovirus type 2 (cvdpv2) were reported syria, which is embroiled in war. where else are similar societal challenges preventing the eradication of polio? uzbekistan. nigeria. pakistan. a and c. b and c.

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