What instrument measures the flow rate of a liquid by comparing the flow through two sections of tapered pipe?

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

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?

The identities of substances are the same before and after which type of change