Q What might the tall projections along Acrocanthosaurus’s back have been used for?

From the neck to the back of Acrocanthosaurus, a series of tall projections formed by enlarged extensions of the vertebrae rose to heights of up to 60 cm (24 inches).
Although they resembled the sail of Spinosaurus, it remains unclear whether they actually formed a sail or were covered by a fleshy membrane or supported by raised muscles.
These projections may have played a role in thermoregulation or visual display, such as attracting mates, but their exact function remains a mystery.