The definition of symbiotic is
having a hard external covering.
consisting of two oxygen atoms.
having tiny tentacles.
living in close association.
The correct definition is: living in close association.
What happens to algae when the temperature in the ocean becomes too hot?
The algae become harmful to coral and are expelled.
The algae are susceptible to infection.
The algae become pale.
The algae thrive, providing benefits for coral