People who get angry easily tend to have more heart disease. that's the conclusion of a study that followed a random sample of 12,986 people from three locations for about four years. all subjects were free of heart disease at the beginning of the study. the subjects took the spielberger trait anger scale test, which measures how prone a person is to sudden anger. here are data for the 8474 people in the sample who had normal blood pressure. chd stands for "coronary heart disease." this includes people who had heart attacks and those who needed medical treatment for heart disease.

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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