Answer:
Origin and Insertion
Explanation:
The origin is the point of attachment of a muscle that remains relatively fixed during contraction.
The insertion is the point or mode of attachment of a skeletal muscle to the bone or other body part that it moves.
more; less
food vacuole or granule:- used to contain food for digestion .
contractile vacuole :- used to remove excess water.
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D) Density of air and humidity levels
