Question

Short Answer Questions Type-1 (Answer in one or two sentences).
1. What is skeleton ?
2. What are the functions of backbone?
3. At least two muscles are needed to move a bone at a joint in one direction. Why?
4. Why we cannot move our elbows, backwards?
5. Differentiate between vertebrates and invertebrates.​

Answer 1

Answer:

ans 1 Skeleton is a framework of bones

Answer 2

Answer:

1. frame work of bones in our body.

2. it gives us support and helps us to stand , sit , bend ,twist.

3. contraction of one muscle and relaxation of another muscle leads to the movement of the joints in one direction.

4. we cannot move our elbow because in elbow there is hinge joint which allows us only to move it on a plane.

5. VERTIBRATES- Animals who have back bone . eg- human, lion etc..

INVETIBRAYES- Animals who do not have backbone. eg- worms, starfish etc..

Explanation:

PLZ MARK ME AS BRAINILEST.......