What are the differences between the concepts of sex, gender, and sexuality?

What are the differences between the concepts of sex, gender, and sexuality? Please explain.
Consider the following: A person’s sex, as determined by their biology, does not always correspond with their gender. In your OWN opinion,Do you agree or disagree?
What questions if any do you still have about the concept?
Please include reference page and citing throughout. 300 words minimum

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