Which scientists have contributed to our knowledge of earth's age?
a-geologists
b-chemists
c-physicists
d-biologists
e-astronomers

The answer is a geologists because they study the Earth.

A geologist is a scientist who studies the solid and liquid matter that constitutes the Earth as well as the processes and history that have shaped it. Geologists usually engage in studying geology.
Geologists have contributed to our knowledge of Earth's age.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

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