Science Ch. 8

Which of these provides support and protection for many insects?

• muscle

• skeleton

• spinal cord

• exoskeleton

What are the two gases that animals exchange with their surroundings?

• oxygen & nitrogen

• nitrogen & helium

• hydrogen & carbon dioxide

• carbon dioxide & oxygen

Suppose that you close a window because you notice that rain is falling. Your action in closing the window is a(n) ____________.

• involuntary reaction

• depressant

• stimulus

• response

Why are some muscles attached to bones?

• They have the same function as bones.

• They move the bone to help move the body.

• They are part of the skeleton.

• All muscles and bones are cartilage.

Which animal has the simplest and least organized nervous system?

• cnidarian

• mollusk

• flatworm

• planarium

What three systems work together to make an animal move about?

• nervous, digestive, muscular

• nervous, skeletal, muscular

• nervous, circulatory, muscular

• nervous, digestive, circulatory

An adaptation that helps amphibians move from place to place in water is ____________.

• eggs covered by jelly

• moist skin

• webbed feet

• a strong skeleton

Tiny, thin-walled blood vessels where the blood and body cells exchange substances are called ____________.

• atria

• ventricles

• capillaries

• single loops

Which animal has a digestive system most similar to a human?

• cow

• jellyfish

• octopus

• wolf

What factor makes it possible for animals with endoskeletons to grow larger than animals with exoskeletons?

• endoskeletons can be removed and replaced

• endoskeletons are lighter than exoskeletons

• endoskeletons are made of fluid-filled tubes

• endoskeletons lack joints that can break down