How does an ion differ from an electrically-neutral atom?
a) there are a different number of protons in an ion compared to a neutral atom. b) there are a different number of electrons in an ion compared to a neutral atom. c) there a different number of neutrons in an ion compared to a neutral atom.
d) there are no differences in subatomic particles.

B) There are a different number of electrons in an ion compared to a neutral atom.  

Explanation:

An ion is an atom that has lost or gained electrons. For example, a sodium ion is formed when a sodium atom loses an electron.

A) is wrong. Atoms that contain different numbers of protons are different elements.

C) is wrong. Atoms that contain different numbers of neutrons are isotopes.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

its first and third is your answer i did the qustion the fourth isnt right