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Some in the Precambrian Super Eon, but mostly hard parts came along in the Cambrian period at about 540 mya (Million Years Ago)
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What is an internal body-support structure called?
endoskeletons
Do vertebrates have endoskeletons?
yes; endoskeleton of vertebrates may be either bone or cartilage
What are two way that some organisms can escape from unfavorable environmental conditions?
Two ways that some organisms can escape from unfavorable environmental conditions would be to move or migrate or to hibernate. Some organisms can even adapt.
What are organisms that have some aspect of their biology governed by lunar cycles?
Intertidal organisms are organisms that are most affected by lunar cycles.
Are al eukaryotes large multicellular organisms?
No. Eukaryotes are simply organisms that have DNA in a separate nucleus. Some are unicellular. Some are multicellular.
Is a sponge a planet?
A sponge is an organism that has specific characteristics. It is a group of invertebrates which are organisms without "backbones" or endoskeletons.
Do seahorses have endoskeletons?
Yes, they have endoskeletons. Seahorses' skeleton are inside their bodies so they would have endoskeletons.
Do lions have endoskeletons or exoskeleton?
Lions have endoskeletons because they are mammals and we are mammals.
Why do we need endoskeletons?
we need endoskeletons because they hold us up. if we had an exoskeleton we would be covered by a shell
Endoskeletons of most vertebrates are composed of?
What materials make up the endoskeletons of most vertebrates
Do reptiles have endoskeletons?
yes they do
Do crabs have endoskeletons?
yes
Do piranhas have an endoskeletons?
yes
Is a cow an endoskeleton?
Cows have endoskeletons. An endoskeleton is found inside the body and is composed of mineralized tissues. Some sponges and symmetrical marine animals also have endoskeletons.
Is elephant exoskeleton or endoskeleton?
A Whale is an Endoskeleton creatures. Endoskeletons - are skeletons that are inside the body and cannot be seen. Humans, Cats and Dogs Have Endoskeletons. All mammals have Endoskeletons.
Do insects have endoskeletons?
Insects have exoskeletons.
Do reptiles and amphibians have endoskeletons?
Yes
