Animal Body Systems

5. Some invertebrates, such as a insects and crabs, have an __________: a rigid external skeleton.
7. Type of reproduction that does not involve fusion of two gametes
8. Type of fertilization that occurs outside the body and common in aquatic animals
11. Purpose of this task is to remove wastes from cellular metabolism
12. Body Systems are __________ to carry out different tasks
13. Two types of circulatory systems in animals are _______ and _______. (name both)
15. Purpose of this task is to produce offspring to ensure that the species survives
16. In simple animals, gases are exchanged directly with their environment through _________.
18. Type of reproduction formed by the union of a male and female gamete.

1. This system provides a framework that supports an animal's body.
2. Many soft bodied invertebrates have a _________ skeleton made of water like a fluid filled balloon.
3. More complex animals have specialized respiratory structures like ______ or ________. (name both)
4. Purpose of this task is to obtain energy and nutrients from food
6. Complex animals have a ____________ to coordinate the activities in their body and allow them to sense and respond in an environment.
9. Purpose of this task is to exchange oxygen and carbon dioxide gases
10. Complex animals, like dogs, have an ____________: hard material such as bone embedded within the animal.
14. Purpose of this task is to transport oxygen and nutrients to the other parts of the body.
17. Type of fertilization that occurs inside the body and common with land animals.