JJ Thomson added to Daltons theory by discovering the electron. He explained that the atom is a positive ball with negative electrons.
The gradual abundance of oxygen (by product of photosynthesis) made it possible for aerobic organisms to grow more and evolve.
Hope that helps!
Answer:
Your answer is most likely D) ss.
Purebred means not bred with anything else, which would mean that the only genes available would be ss.
