Adrug-drug reaction in which the two drugs combine to produce an effect greater than the independent effect of each drug is called

Can someone me with this and tell me what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons