Which is true about fossil fuels?

a.
coal came from ancient plants, while oil and natural gas came from marine organisms.

b.
oil and coal came from dinosaurs, while natural came from marine organisms.

c.
coal came from marine organisms, while oil and natural gas came from fish.

d.
natural gas and oil came from ancient plants, while coal came from dinosaurs.

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Calculate the number of moles of ethane in 100 grams

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?