Physics Help ! please answer the multiple choice. I included a pic. thank you

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

Which branches of natural science include the study of an organism that lived 10 million years ago

Explain why electric current cannot exist if a current doesn't have a voltage source.