Question
A potassium ion has a positive charge because it contains fewer _________ than Protons. (Electrons, Protons, Neutrons)
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Cell organelles perform __________ function bin all organisms.
Tube feet are the __________ organs of echinoderms.
| Number of protons | Number of neutrons | Mass number | Atomic number | Number of electrons | Valency |
| 11 | 12 | .............. | .............. | .............. | .............. |
A nerve impulse passes from one neuron to another across a __________.
The two important contributory causes of diseases are _________ and _________ make up.