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What is The external skeleton of many invertebrates is made of?
chitin
Animals with shells on their bodies?
Arthropods are defined to be invertebrates that have an exoskeleton ( an external skeleton).
Are crayfish a mammal?
No, crayfish are invertebrates, as they have an external hard covering, and they do no not suckle their young!
What invertebrates have jointed limbs and a hard external skeleton?
ARTHROPOD Crustaceans Also, insects, arachnids, etc. Generally, invertebrates with jointed limbs and a hard external skeleton are called arthropods. See http://en.wikipedia.org/wiki/Arthropod
Is a mussel a invertebrate?
Yes. It has a shell. Invertebrates have no backbone, vertebrates do. Invertebrates often have a hard external shell (like a mussel), or exoskeleton (like a crab), to protect them from predators.
List of animals that have external fertilisation?
Some animals that have external fertilization include fish, frogs, sea urchins, and certain aquatic invertebrates like jellyfish and corals.
Is a sea slug a vertebrates invertebrates?
All mollusks are invertebrates because they have no internal skeleton with a backbone. Sea slugs don't even have an external shell like most mollusks do!
Are beettles vertebrates?
No, beetles have an external skeleton/shell with no backbone and they with all other insects are considered invertebrates.
Do rolly pollys have back bones?
No insect has a backbone - they are all invertebrates with an external skeleton instead of an internal one.
Are crabs Invertebrates.?
Yes, as a vertebra is a piece of a backbone. As such invertebrate means an organism that does not have a spinal column or back bone. Crabs have an exoskeleton (their external shell serves as a skeleton) instead of a back bone, they are therefore considered invertebrates. Crabs have no bones, including no vertebrae (backbones). They are invertebrates.
Why are vertebrates able to grow larger than invertebrates?
Vertebrates have an internal skeleton and invertebrates have external skeletons. Vertebrates are able to grow larger than invertebrates because of this. Invertebrates would crush themselves under their own skeletons if they grew to a large size.
What do invertebrates have instead of bones?
Invertebrates do not have a spine (backbone) like vertebrates do. Fish, Birds, Reptiles, Amphibians, Mammals are vertebrates with internal skeletons, spines, heads, and brains with central nervous systems. All insects are invertebrates and they mostly have exoskeletons (external skeletons), and no backbones. Their internal organs make up the entire contents of their interior structures.
