All organisms are made of four different types of carbon-based molecules. these four types of macromolecules include carbohydrates, proteins lipids, and which other type of molecule? a) nucleic acid b) water c) glucose

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the answer is third world countries, take for instance china, they restricted each family with only one child,

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answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]