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Answer:
this is the answer to your question
The armor protects the skeletal system and has joints. so you could put armor is to skeleton as shell to crab.
Answer:
Proved
Explanation:
Given

Required
Prove
In trigonometry:

So, we have:

Express each identity as an inverse:

Rewrite as:

Express tan as sin/cos:







Proved
You didn't provide us with a list of factors that influence and define the body's ability to change direction. However, a good perceptive/sensory system (being able to hear, see, and smell good) helps us decide on which was we're supposed to move in the next sequence of movements. This, coupled with an active motoric system then provides us with the necessary and optimal tools for changing direction.