Active transport occurs in cells, for example, when the Na-K pump is at work. Any process that involves active transport most often involves the .

The right answer is B. movement from a lower to a higher concentration. Active transport is defined as a transport process that only takes place in the respective system when energy is supplied from the outside.

amber has allowed scientists to study dna that has been preserved over millions of years.

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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