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This is math, not English, but okay xD
"Two intersecting lines are perpendicular if and only if they form four 90 degree angles" would be my answer.
Answer:
Explanation:
"Instinctual" appears more frequently in scientific writing and refers to the notion of behavior itself, while "instinctive" may sometimes be reserved to describe specific behaviors. ... Instinctive is defined as “of, relating to, or being instinct” and “prompted by natural instinct or propensity : arising spontaneously.”
