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Figure 9-1 A Simplified Sectional View of the Knee Joint
Use Figure 9-1 to answer the following questions:
-Identify the structure labeled "2."
Arthropods
Arthropods are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages, including insects, arachnids, and crustaceans.
Cephalopods
Cephalopods are a class of mollusks that includes squid, octopuses, and cuttlefish, known for their advanced nervous systems, highly developed eyesight, and ability to change color and texture.
Annelids
A phylum of invertebrate worms characterized by segmented bodies and often found in wet environments.
Hemoglobin
A protein found in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.
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