What does food give us? Why is it necessary when we sleep?

What does a food chain how?

What does the food chain consist of ?

What does a food chain always start with -

Imagine what would happens if we do not standard symbols for elements. (OR) is it necessary to use symbols for elements? Write your opinion.

We have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why ?

What does a food chain always start with?

Do we need energy when we sleep ? Why/why not ?

What happens if a couple give birth to more than two babies? Is it necessary to control population. Why?

When we go on a busy road, feel uneasy even when we close nose with a napkin. Why these symptoms we observe?

What kind of tastes do food substances we eat have?