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yes a cactus will survive because it stores water in its trunk for when it needs it most
Depending on the body part, in quite a few ways... you have to have body partsto survive.
Male tortoises will often fight over a potential mate. Each male has a long gular shield under its head that is part of the animal's shell. The tortoise will use this to try and flip a rival onto its back. If the defeated tortoise is unable to right itself, it will die.
No
Well if you want to survive in the desert, you will need a way to either carry water or obtain water. Such things are technologies. You will need many other things too that are not part of your own body... all of those are also technologies.
The shield covering a tortoise's body is called a carapace. (Yup and the Carapace is actually part of the tortoise's skeleton)
pointy teeth
its exoskeleton
A Macaw has a special body part?
its fur
Head, thorax and abdomen as for all insects.
The Libyan Desert is part of the Sahara Desert. The Colorado Desert of California is part of the Sonoran Desert