system
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human
Did the Apatosaurus have any true predators as a threat?

I mean, let's face it, she was monstrous even by dino standards.  I get starving desperation could take one down, but I mean just every day threats, any critter have its number 24/7?
gpt
Yes!

Apatosaurus and the closely related genus Brontosaurus were early diplodocids and lived alongside such terrors as the four ton, eight metre long Allosaurus and Saurophagnax. We also find the slightly smaller Ceratosaurs.

We know the sauropods of the Morrison Formation laid large clutches of eggs in large egg nests. We also know the landscape wasn't nose to tail with them, so very few made it to adulthood. Of course, once they did, they were immune to any predation.

This means their young and juveniles had an enormous attrition rate. The infants would be preyed upon by the likes of Coelurus and Ornitholestes, the early coelurosaurs. Once the animals were the size of a horse or so (around a year's growth!), they were too large and strong for these, but they'd be a prime target for the larger theropods, the allosaurs and ceratosaurs, until they reached ten to fifteen years.

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Edit: It's also worth noting that Apatosaurus and Brontosaurus juveniles had a much larger disparity between fore and hindlimbs than adults did. This is interpreted to mean they could run on their hindlimbs alone. As the coelurosaurs are known to be fast and agile, it'd be sensible for their prey to have a good set of running legs too.