Blood returns to the heart via the . a) aorta b) pulmonary arteries c) pulmonary veins d) aorta and pulmonary arteries e) aorta and pulmonary veins

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

the answer is c.) there is a warm front in region a and a stationary front in region b.

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