Which evolved first: viruses or living organisms?

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not

Which spheres are involved when sedimentary rocks formed from parts of seashells at the bottom of the ocean? a.) biosphere, atmosphere, geosphereb.) geosphere, hydrosphere, biosphere c.) geosphere, exosphere, hydrosphered.) hydrosphere, biosphere, atmosphere