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An exoskeleton - i.e. a shell.
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∙ 10y ago
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Why is a crayfish not a fish?
A crayfish is not a fish because they have bones on the outside of their body fish don't.
How can you tell if an animal has bones on the outside?
Animals with bones on the outside have an exo-skeleton. Crabs, crayfish, lobsters and many insects have their bones on the outside.
Do crayfish have a bachbone?
Nope. They have a shell, known as an exoskeleton. Means bones are on the outside (the shell takes the place of bones)
What 2 systems of a crayfish are most unlike human systems?
Exoskeleton: Crayfish have a hard shell, and no bones. That makes crayfish invertebrates (no spine). Gills: Crayfish respire underwater through gills, where humans use lungs. The circulatory system is the second one, the reason for this being that crayfish have no blood vessels (and humans obviously do).
Do Crayfish have bones?
I am not sure, but from what I can conclude from diagrams and from a recent dissection no, the crayfish does not have a liver. Although you should consider asking your biology teacher just to be sure.
How many ears do crayfish have on their body?
A crayfish can have as many eggs as it wants it just has to be healthy but I think it can lay 50-200.
Can a tarantula have bones or not?
No, tarantulas do not have bones. They, like all arthropods, have an exoskeleton instead.
Do sharks have catilage instead of bones?
Yes
What is the freshwater lobster?
Crayfish
Is crayfish blind?
Crayfish can hear, but they do not have ears, so they do not hear in the usual sense. Our ears pick up vibrations via the eardrum and tiny bones in our ears, but crayfish have thousands of sensory bristles. Some of these sensory bristles respond to chemicals, others to touch, but either way, they enable te crayfish to not only hear, but also to smell and feel.
Which fish does not have bones?
Most fish have bones. Sharks and rays do not have bones but they do have bone-like structures that are made from cartilage.
What if the middle layer of your bones was heavy instead of light?
Our bones would be very weak and we would break them easily
