Answer:
A tiny sense positively charge core called a nucleus in which nearly all the mass is concentratedm
Answer:
Reptiles, marsupials, dogs, and cats
Explanation:
The more acidic the substance is, the more the iron nails will corrode (this obviously depends on what your experiment is but hope this helped in some way)
The average weight of an atom of an element, formerly based on the
weight of one hydrogen atom taken as a unit or on 1/16 (0.0625) the
weight of an oxygen atom, but after 1961 based on 1/12 the weight of the
carbon-12 atom.
