1) D chromosomes
2) B a double helix
3)A chromosomes are made of DNA
4)A genes
Answer:
Arteries carry blood away from the heart
Explanation:
Veins carry the blood back to the heart.
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Answer: More than 90% of measles infections occurs in children under 15 years old.
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<span>The appropriate answer is c. sonar. Oceanographers use sonar to determine the ocean depth. A sonar signal is sent from the ship. Oceanographers record the time taken for the signal to leave the ship and for it to return. Knowing the speed of sound in water, they are able to calculate the depth of the water. This method is also used to generate bathymetric images of the ocean floor. </span>