The student is expected to: 7A analyze and evaluate how evidence of common ancestry among groups is provided by the fossil record, biogeography, and homologies,

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The student is expected to: 7A analyze and evaluate how evidence of common ancestry among groups is provided by the fossil record, biogeography, and homologies, including anatomical, molecular, and developmental; 7E analyze and evaluate the relationship of natural selection to adaptation and to the development of diversity in and among species; 8C compare characteristics of taxonomic groups, including archaea, bacteria, protists, fungi, plants, and animals

KEY CONCEPT Crustaceans are a diverse group of ancient arthropods.

Crustaceans evolved as marine arthropods. Crustaceans share several common features. two distinct body sections, cephalothorax and abdomen one pair of appendages per segment two pairs of antennae exoskeleton carapace

Crustacean appendages can take many forms. Crustacean appendages are used for a variety of functions. collecting and manipulating food attracting females protection

Appendages include claws, antennae, walking legs, swimmerets, and mandibles.

There are many different types of crustaceans. Crustaceans vary in both anatomy and structure. Decapods such as lobsters and crabs have ten legs.

Barnacles are sessile filter feeders wrapped in a hard shell.

Isopods such as pill bugs have flattened bodies and seven pairs of legs. Tongue worms are parasites found in a host’s lungs or nasal passages.