Please help me out with this

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?