O
A. C with G, and A with T
O
B. C with A, and G with T
O
C. C with T, and G with A
O
D. C with C, and G with G
E PREVIOUS

A

Explanation:

The DNA is made 4 nitrogenous bases. A (adenine) pairs with T (thymine) and are held by two hydrogen bonds. C (cytosine) pairs with G (guanine) and are held by three hydrogen bonds.

You might wanna remember this by the preposition 'at', which ultimately makes C and G together. Or you might wanna remember it by something like G- CAT.

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.

easy

explanation: