what is rational numbers ? Give two examples.

What are rational numbers? Give four examples of each of positive rationals and negative rationals. Give an example of a rational number which is neither positive nor negative.

What are rational numbers? Give Examples of five positive and five negative rational numbers. Is there any rational number which is neither positive nor negative? Name it.

What is tautomerism ? Give two examples.

What are carbenes ? Give two examples.

What are antihistamines ? Give two examples.

What is mass number? Give examples.

What are arenes? Give two examples.

What is parthenogenesis? Give two examples.