Invertebrates Biology Quiz

Questions and Answers

100%

50%

75%

95% (correct)

A brain

Skin

A backbone (correct)

A heart

A shell

Segmented bodies (correct)

Soft bodies

Jointed arms

Insects Signup and view all the answers

An exoskeleton Signup and view all the answers

Mollusks Signup and view all the answers

Soft bodies Signup and view all the answers

Soft bodies Signup and view all the answers

To protect the body Signup and view all the answers

Because they do not have bones Signup and view all the answers

Study Notes

Invertebrates make up at least 95% of all animals in the world.
The common characteristic among all invertebrates is the absence of a backbone.
Invertebrates have soft, simple, and often small bodies due to the lack of bone support.
They are also cold-blooded, meaning their body temperature changes with the environment.

Arthropods have segmented bodies and are the largest group of invertebrates.
They can live on land (spiders, insects) or in water (crayfish, crabs).
Insects are the largest group of arthropods and many can fly.
Arthropods have jointed legs or limbs for easier movement.
Most arthropods have an exoskeleton, a tough outer skin or shell that protects their body.

Mollusks have soft bodies and live on land or in water.
Many mollusks have shells to protect their bodies (snails, oysters, clams, scallops).
Some mollusks do not have shells (octopus, squid, cuttlefish).

Coelenterates (jellyfish, sea anemone) have soft bodies and stinging tentacles.
Echinoderms (starfish, sea urchin) are spiny sea creatures that live only in the ocean.
Sponges are invertebrates that attach themselves to other things in the water and cannot walk, swim, or fly.
Annelid worms (earthworms, leeches) are also invertebrates.
Protozoa and flatworms are invertebrates that are too small to be seen without a microscope.