The answer would be nodding.
First class lever refer to a lever on which the resistance exist in one one side of the fulcrum and an effort is made on the other side you can't get a reaction unless something else causes a reaction.
1 - complete protein
2-Vegetables
3-??
4- ??
5- Vitamin A
6 - Sucrose
7- ??
8-??
9- Citrus Fruits
Approximately, at least 4,000 young people try smoking for the first time each day.
Hope this helps!!
