What does the narrator mean when he says there is a finite amount of energy in the universe?

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

The dominant wavelength of energy emitted by the sun is

Baby melanie smiles, giggles, and laughs frequently with both her parents as well as other caregivers; baby jerome does not. all else being equal, we can predict from this that