Earthworm movement

What support the snail's body?

• Exoskeleton

• Endoskeleton

• Segmented abdomen

• Hydrostatic skeleton

Unlike bones, an exoskeleton....

• is on the outside of the body
• grows with the animal
• is made of fur
• is made of slime

The skeleton of the hand consists of the ___, the metacarpals, and the phalanges.

• tarsals

• metatarsals

• carpals

• fibula

Are bones dead or alive?

• Dead

• Alive

the period between two ecdysis is known as

• instar

• moult

• antagonistics

• chitin

Tick TWO types of muscles on the walls of the earthworm's body

• Vertical muscle

• Circular muscle

• Longitudinal muscle

• Horizontal muscle

The diagram shows the movement of an earthworm. What happens to the body of the earthworm when the longitudinal muscles contract and circular muscles relax?

• The segments of the body will shorten and thicken

• The segment of the body will become longer and thinner

The diagram shows the movement of an earthworm. What happens to the body of the earthworm when the longitudinal muscles contract and circular muscles relax?

• The segments of the body will shorten and thicken

• The segment of the body will become longer and thinner

What happens to the longitudinal muscles when circular muscles relax

• Contract

• Relax

What support the snail's body?

• Exoskeleton

• Endoskeleton

• Segmented abdomen

• Hydrostatic skeleton