Task 2.18 Using Mathematics and Computational Thinking A double-stranded DNA molecule was found to have 13 % of all its bases being A (adenine) • Deduce the percentages of T, C, and G in this double strand of DNA, using the known percentage of A • Justify each calculation, by providing information from the previous page or from a textbook

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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.

the correct answer is 2 and 4

i wish i could with all of them i can barley see the first one so here's the answer to the first one b