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Lessons 64 - 66

Science in the Beginning
Across
The fins on the underside of the fish, near the rear, used to keep the fish rightside up in the water.
An animal that has a backbone.
The system of support in an animal;for vertebrates, it is a skeleton is made of bones; for invertebrates, it is a hard outer covering known as an exoskeleton.
An animal that does not have a backbone.
An inflatable sac in a fish that allows it to change its volume so as to change depth.
The fin on the tail of the fish, used to propel the fish through water.
The fins on the underside of the fish, between the anal and pectoral fins, used to keep the fish rightside up in the water and also used by some fish to slow down.
The fin on top of a fish, used to keep the fish rightside up in the water and used by some fish for protection.
Down
An animal that eats another animal.
The frontmost fins of a fish that are used for steering.
A slender, flexible extension of an animal, such as a jellyfish.