Answer:
I will follow you then you follow back to me ok
Answer: i think its B trees
Explanation:
For the first one, electrons travel around the nucleus in fixed energy levels with varying energies.
Second one, protons, neutrons, and electrons have a mass, but electrons have far less mass
Third one, cations and protons
Fourth, not sure.
Scientists can use DNA sequences to help determine if they have discovered a new species. Scientists can also compare DNA sequences from different organisms and measure the number of changes (mutations) between them to infer if species are closely or distantly related.