Answer the following question:
Which changes occur in persons continously using the internet and mobile phones?

Answer the following questions : Define chemical change ?

Answer the following questions : Define physical change.

Answer the following questions: State the use of a periscope.

Answer the following question: Write the uses of natural dye.

Answer the following questions: Which stems are used as vegetables?

Answer the following questions : Where is this microscope used ?

Answer the following questions : State uses of a convex lens .

Answer the following question: What type of changes occur in the amount of energy during its transfer from plants to apex consumers?

Answer the following questions : State the use of a telescope .