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Amphibians evolved directly from which ancestral organisms?
Waxy Substance
A general term for materials that are solid at room temperature and have a slippery or glossy texture; in biological contexts, it might refer to substances like cholesterol.
Cells
The smallest structural and functional units of life, which can replicate independently and are made up of cytoplasm enclosed within a membrane.
Blood Pressure
The force that circulating blood exerts against the walls of the arteries.
Physical Activity
An activity that requires bodily movement, producing an increase in heart rate and energy expenditure beyond resting levels.
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