It's called peristalsis. It occurs through the oesophagus all the way through the digestive tract.
Answer:
b. radio navigation systems and global positioning systems will be inaccurate
Explanation:
I just took this test
There are many answer you have to be specific
<span>The types of skeleton depend on where they are located. Earthworms have hydroskeleton because their rigid bodies are based on water pressure so it's hydro then. Endo is found in animals like birds and also humans who have it inside. Exo is found in spiders because they are bugs and bugs have their skeletons like a shell that covers them.</span>
