Question

Which of the following statements is true?
Question 5 options:

Endoskeleton is a skeleton inside the body, like yours. An exoskeleton is outside the body, like a grasshopper's.

All skeletons are made mostly of cartilage.

Exoskeleton is a skeleton inside the body, like yours. An endoskeleton is outside the body, like a grasshopper's.

An exoskeleton is usually made of bone or cartilage, but an endoskeleton is made of a different substance called chitin.

Answer 1

A is true, B is false and cartilage is used between bones to reduce friction, C is opposite of A and thus wrong, and D is the opposite. The protein chitin is an exoskeleton and what gives a 'crunch' sound when you crunch a Animeroach, for instance.

Answer 2

Exo means out and endo means in, and this is applicable to anything from chemistry to mathematics.