They create a different substance because on the periodic table each substance has a certain amount of protons and if you add or take away protons and/or electrons it will create a different substance. For Example Nickel has 28 protons but if you add 2 more you get zinc and that has 30 protons. Another Example is
what if you have Titanium which has 22 protons and take away 2 you get Calcium which has 20 protons.
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ps: The periodic table is attached as a picture to this answer
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"AB84"
If u are talking about transport in cell then molecules pumps in from high to lower concentration.
Answer:
D) increased illnesses that result in a decrease in population
I believe your answer is A hope that i helped out
Answer:
Darwin suggests that the strongest survive and adapt to produce even stronger more adaptable offspring