The answer is A. Energy first enters an ecosystem through light energy that is absorbed through photo-synthesizers
Answer:
C
Explanation:
The charge on an atom depends on the number of protons and electrons present in it. The protons in an atom are positively charged while electrons have a negative charge. For a neutral atom, the number of protons balances the number of electrons. for a negatively charged atom, the number of electrons is more than the number of protons. for a positively charged atom , the number of protons are more than the number of electrons.
The chemical reactions necessary are unable to occur without the addition of different ingredients
...with the discovery and identification of the electron; and with the discovery of the first subatomic particle.
C'mon man, this is on the wiki page for J.J. Thomson, first paragraph.
