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Using marginal analysis, explain why many restaurants and coffee shops offer low-cost refills on beverages (for example, a shop may charge $1.50 for a cup of coffee and only $.50 for a refill).
Annelids
A phylum of invertebrate animals characterized by their segmented bodies and include earthworms, leeches, and marine worms.
Diving Marine Mammals
Marine animals, such as whales, seals, and dolphins, adapted to diving deep under water to feed, communicate, or avoid predators.
Adaptations
The method through which a species adapts to its surroundings; this occurs as natural selection works on variation that can be passed down through generations.
Seals
A group of aquatic mammals known for their streamlined bodies, flippers, and often living in cold seas, part of the family Phocidae.
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