17. A cell maintains homeostasis by regulating its internal conditions. In order to remain in balance, a cell must — maintain its pressure within a certain range. maintain a low pressure when it is resting. maintain a high pressure when it is active. maintain the same pressure at all times.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

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