The three correct answers that describe the lifestyle of the earliest humans such as Homo habilis are:
- They made use of tools and weapons.
- They lived in groups of 10–12 adults and their children.
- They hunted animals and probably scavenged food left by other predators.
Homo habilis is known for its tool-making abilities, social structures that likely included small groups, and a diet that included both hunting and scavenging. The other options regarding settling in one area to raise crops or spending more time in trees are not representative of their lifestyle.