Which technology used to generate electrical power involves a trade-off between economical electricity and long-term waste disposal problems?
solar collector
fossil fuel
nuclear reactor
wind turbine

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

What advantages does a pedigree have over a written passage?

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm