What is a non example of mutation

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

Earths energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your homes electricity, and explain why you chose that source. can someone give me some ideas, i’m kinda confused.

Electrochemical cells provide energy by allowing electrons to flow through an external circuit to electrodes contained in an electrolyte