Answer:
<em>A. Atoms are composed of protons, neutrons, and electrons.</em>
Explanation:
<em>Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.</em>
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The ecosystem requires a constant input of energy because energy cannot be stored. The enrgy always gets converted for supporting life in the ecosystem. Some amount of energy is also lost during this conversion. So if there is not a constant supply of energy, then the ecosystem will ultimately breakdown. In case of humans, the energy is received by consuming food. The energy of the food geets converted to the enrgy that helps a human being to complete his daily chores. So energy is being lost at every step. To regain this energy the humans have to eat food regularly. This way the humans need a constant supply of energy to survive. It is the same in the case of all living things in the ecosystem.
Answer:
F. is the only mass extinction even to have occurred
Explanation:
its only f
Coal is the most-used fossil fuel for energy production in the United States. This is controversial because although coal is abundant, it is one of the worst pollutants.
