Assertion: Red data book has a record of all animals. Reason: Endangered species need to be noticed. A) Both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion B) Both the Assertion and the Reason are true but the Reason is not a correct explanation of the Assertion C) The Assertion is true but the Reason is false. D) Both the Assertion and the Reason are false. E) The Assertion is false but the Reason is true.

I want  complete notes on the chapter friction 

In my book subtopics are:

Friction 

Types of friction 

Factors affecting friction 

Methods of reducing friction 

Methods of increasing friction 

Advantages and disadvantages of friction 

Some real life based situation where friction is applied.

How to make a monomer into polymer if it is an addition polymer example

This planet, _______ is yellowish in colour and has many rings and satellites.

A. Uranus

B. Jupiter

C. Neptune

D. Saturn

Pasteurized milk does not need to be boiled. Why?

Write the $pH$ value of the

1. Saliva (before meal)

2. Saliva (after meal)

3. Lemon juice

4. Colourless aerated drink

5. Carrot juice

6. Coffee

7. Tomato juice

8. Tap water