A theory would be replaced of contradicting new evidence is found.
Calcium oxide is an ionic, chemical compound created by equal transfer of atoms. As described, calcium loses two electrons, giving it a +2 charge and an atom of oxygen picks up two electrons, giving it a –2 charge. This event is called ionic bonding where there’s a complete transfer of valence electrons between atoms. Usually, metals are the ones donating their valence electron (e.g. calcium) and it’s the non-metals who accepts the donated electrons (e.g. oxygen).
Answer:
The answer is C: Organ
Explanation:
A single organ is made of tissue, which carries out a specific function, multiple organs carrying out multiple functions make them an organ system.
Answer:
The iris, or the colored part of the eye surrounding the pupil, controls how much light enters the eye. The iris can make the pupil bigger or smaller by opening or closing. Lens. Behind the pupil and the iris is a transparent structure that looks similar in shape to the lens of a magnifying glass.
Explanation:
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