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TELL ME WHY.UNIT 35

WHY DO OCTOPUSES HAVE THREE HEARTS?

DEFINITIONTERM
An animal without a backbone. invertebrate
One of the two hearts that pump blood to the gills. branchial heart
Organs that extract oxygen from water. gills
The red oxygen-carrying protein found in human blood. haemoglobin
A reddish-brown metal found in hemocyanin. copper
To move slowly with the body close to a surface. crawl
The bottom of the sea. seabed
An animal that hunts other animals. predator
An animal hunted by another animal. prey
The ability to blend into the surroundings. camouflage
The surface quality or feel of sth. texture
Extremely unusual or impressive. remarkable
A problem requiring thought to solve. puzzle
A tank where sea animals are kept. aquarium
The ability to see well. eyesight
A characteristic that improves survival. evolutionary advantage
Created by: e_teacher
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