Oxygen and sugar is transported to cells by the what system 1. Excretory system
2. Nervous system
3. Circulatory system

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Write the balanced equation for a reaction between aqueous nitric acid (hno3) and solid lithium metal (this is a single replacement reaction)

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.