Read the following to give the correct answer.
1.
| Assertion (A): | Animals like oxen and horses were used by humans to pull carts in the past. |
| Reason (R): | These animals use muscular force to perform such work. |
2.
| Assertion (A): | Muscular force is a type of non-contact force. |
| Reason (R): | Muscular force is produced by the contraction and relaxation of muscles in the body. |