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Herd Immunity › ViewHow far should you be from someone to be socially distant?
A. 1 yard
B. 6 feet
C. 36 feet
D. 9 feet
Skeletal System › View
Skeletons of jellies and worms which are made up of fluid-filled body cavities.
A. exoskeletons
B. endoskeletons
C. hydrostatic skeletons