The medulla, part of the brain stem, reacts quickly to increased levels of carbon dioxide in the blood and stimulates a response from the- *

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Did you know that a blue wales tongue weighs more than an elephant?

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