In what way does the endocrine system cause homeostasis

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Areaction in which products can react to re-form reactants is

How many moles are in 7.2 x 10^23 carbon molecules?