Identify the positively-charged sub-atomic particle in the nucleus. a) electron b) neuron c) neutron d) proton

The PROTON (option D) is the positively charged sub-atomic particle in the nucleus.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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the dependant variable is spilled water

the independent is the heat