The accusative case canonically indicates a direct object.  Latin has six cases, and remnants of a seventh.

The purple worm has a multiattack consisting of a bite and a sting.

Unlike chimpanzees, whose females have bright red swollen buttocks when ovulating, females in humans evolved to have concealed ovulation, and do not have any perceptible signs that indicate their fertility.

You can go outside and play when you're finished with your homework.