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3.1
Explain the feedback mechanisms that control ventilation and circulation to include
the pacemaker of the heart.

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.

Match the description of each organism to the appropriate category

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?