D energy is absorbed making it feel colder.
The definition of endothermic means energy is absorbing and there is not as much heat anymore
The Calcium atom has 2 valence electrons but a Calcium ion will have no electrons because it is a cation ion. Meaning that there are more protons than electrons. Also, the normal calcium symbol is Ca but the calcium ion is Ca²⁺
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i think it is the last option a pure substance that can be separated into different elements by chemical means
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B) Native fish species will begin to decrease in population size.
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Answer: a.KOH
Potassium hydroxide is an ionic compound where the K+ is the cation and OH−is the anion. At the same time, the compound also contains a covalent bond since the anion, OH−is formed from electron sharing between the O and H atoms.
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