Dave proceeds to deactivate HAL 9000, a sentient computer that has malfunctioned. When HAL realizes that Dave is going to deactivate him, it goes through many of the stages of grief, expressing anger and depression, attempting to bargain, and accepting its fate.
The tribe of hominids wakes up to find a strange black monolith in front of them. At first, they are extremely anxious and cautious about it. They calm down once they touch it, and as a tribe, they gather around it.
One of the hominids finds an animal carcass and recalls the black monolith he previously saw. He makes a connection and realizes that he can use the bone as a tool. He uses the bone to destroy the carcass and eventually uses it to kill other animals for food. The hominids change from herbivores to omnivores and use tools for war.