Animal Body Systems

5. Type of fertilization that occurs inside the body and common with land animals.
7. Some invertebrates, such as a insects and crabs, have an __________: a rigid external skeleton.
8. Body Systems are __________ to carry out different tasks
9. Purpose of this task is to produce offspring to ensure that the species survives
10. Many soft bodied invertebrates have a _________ skeleton made of water like a fluid filled balloon.
14. Purpose of this task is to transport oxygen and nutrients to the other parts of the body.
15. Type of fertilization that occurs outside the body and common in aquatic animals
16. Purpose of this task is to obtain energy and nutrients from food
17. Complex animals have a ____________ to coordinate the activities in their body and allow them to sense and respond in an environment.

1. Type of reproduction formed by the union of a male and female gamete.
2. This system provides a framework that supports an animal's body.
3. Complex animals, like dogs, have an ____________: hard material such as bone embedded within the animal.
4. More complex animals have specialized respiratory structures like ______ or ________. (name both)
6. Type of reproduction that does not involve fusion of two gametes
9. Purpose of this task is to exchange oxygen and carbon dioxide gases
11. Two types of circulatory systems in animals are _______ and _______. (name both)
12. In simple animals, gases are exchanged directly with their environment through _________.
13. Purpose of this task is to remove wastes from cellular metabolism