What is the period of growth and development in a cell's life cycle?

PLEASE HELPP MEEE. I NEED AN ACTUAL EFFORT ANSWER NOT THAT YOU GUYS CAME HERE JUST TO COME FOR POINTS AND GOOGLE IT! SO< THIS IS WHY I NEED AN ACTUAL EFFORT RESPONSE EFFORT BECAUSE ID DON'T UNDERSTAND!

Thank you for your kind help :)

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)