Well, there is no options to pick from so im going with my gut there are 2 uses for the horns:
#1. They were used for defense
#2. they were used to kill prey
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Organisms get the energy they need from food just like us humans do.
Answer:
Noble gases
Explanation:
Noble steam, any of the seven chemical elements that make up the periodic table in group 18.
Within normal conditions, noble gases are colorless, odorless, tasteless, and nonflammable gases. The noble gases are grouped according to their boiling point in the periodic table. Noble gases, from incandescent lamps to excimer lasers, are commonly used in distinct areas.