What form is the underlined verb in the sentence?
native american tribes in the eastern united states first *played* this fast-paced game hundreds of years ago.
a. past participle
b. past
c. present
d. present participle

What is a metal replacement reaction

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons