It is a process of putting together or grouping object with common properties.

It is a representation that communicate and group ideas.

It means telling observation to other people.

Scientists need these also to be successful in their study.

round ball

hot fire

unpleasant smell of socks

salty pizza

loud alarm clock sound

You are asking a lot of question about your observation.

You are telling the truth about your results of your experiment.

You are waiting calmly with the results of the experiment.

You are telling about your observation based on facts.

What are the animals living on the land?

What are those animals living on the land and also in the water?