Answer:
reactant : a substance that takes part in and undergoes change during a reaction.
atom: the basic unit of a chemical element.
product: a substance produced during a natural, chemical, or manufacturing process
molecule: a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Explanation:
Answer:
It's the first option. A distance between two similar points on a wave of light.
Explanation:
On a wavelength chart, where you measure the rate at which the light travels at its distance from the source. You have two points to compare to.
B
All cells new oxygen and blood is a way for them to get it
Positive because it keeps going ok
