I believe the only valid answer for this is Charley Chaplin. However the Eiffel Tower and blue-ringed octopus may also be considered as "valid answers" but only in the case where the school teachers eat chocolate-mango brownies under Jamaican palm trees. This said, I'm sure you've already come to the obvious conclusion that the skeleton is not a musical instrument, though it can prove to be useful for invertebrates when trying to read and understand and answer absurdly incomprehensible questions that sometimes come up when you put a million monkeys on a million typewriters.
hgh
Arthropods are invertebrate animals such as crustaceans. An arthropod that is useful to humans is the lobster, as it can be eaten.
Some animals have that a hydrostatic skeleton include jellyfish and earthworms. Additional examples include sea urchins and starfish. As a result of their flexibility, hydrostatic skeletons are particularly useful for locomotion.
Here are some of the helpful things invertebrates do:Bees pollinate plants, which provide food and oxygen for all living thingsFossilized invertebrate skeletons are used in cleaning productsSpiders kill pests that might cause diseasesSponges are used in cleaningHorseshoe crabs create chemicals used in medicineMany insects serve as food for other animals
Plants release oxygen as a by product of photosynthesis. This allows animals to breathe. Also, plants drop dead leaves on the soil, which become food for a multitude of invertebrate animals like insects and worms.
dung beetles roll up poo in little balls so you wont have to step in it
Useful animals help man complete their task more easily...
For animals that live there ... yes.
Any thing at all... from Yash Patki
Animals that produce poison.
Animals are useful for plants bacause tja e plant needs carbon in night and animals do need
gago