2. Which of the following best describes the theme of the passage?
a. The agricultural revolution changed human food preferences.
b. Some plants today are similar to their ancestors.
c. Farming replaced hunting and gathering,
d. Agricultural communities developed from hunter-gatherer communi-
ties, and the practice of agriculture introduced new environmental
problems.

the form of energy changes and the total energy increases0l

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: