Answer: option B. The number of the outer most energy level for elements in that period
Explanation:
It would be 6 because of the elements
Actually when the oxpecker bird eats insects off the back of the rhinoceros. They are helping each other. The bird gets a nutritious snack while the rhinoceros gets those pesty and annoying bugs off of him. This is also called a S<span>ymbiotic relationship. When both organisms of different species work together to benefit the other.
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