Why are adipose tissue, blood, and bone all considered to be connective tissues? why are adipose tissue, blood, and bone all considered to be connective tissues? they have a common origin: the embryonic tissue mesenchyme. they have the same types of cells. they connect to each other. they all have collagen and elastic fibers in their extracellular matrix.

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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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