9781422270929

WORDS TO UNDERSTAND

asphyxiating: describing a lack of oxygen in the body that leads to unconsciousness and even death cardiorespiratory: relating to both the heart and the respiratory system chronic disease: diseases like diabetes that limit activities, last for more than a year, and require continued medical care fraternal twins: a genetic outcome in which each child of the same pregnancy is produced from two different eggs; they may be of the same or different sexes genetics: properties that determine the features and characteristics of an organism hygiene: practices that maintain health, such as brushing your teeth or bathing

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