Early Humans: Physical Changes & Tools

How did human brains change over time?

• Stayed the same size

• Got smaller

• Changed shape

• Grew larger

What advantage did bigger brains give early humans?

• Could eat more food

• Improved eyesight

• Faster running

• Better problem-solving

How did human thumbs change to help with using tools?

• Grew an extra joint

• Became smaller

• Developed rougher skin

• Became stronger and more flexible

What was a benefit of walking on two legs?

• Faster swimming

• Better tree climbing

• Improved hearing

• Hands free for carrying

Why did human guts become shorter over time?

• To make room for larger lungs

• Because of eating more plants

• To help humans run faster

• Due to eating meat and cooked food

How did human bodies adapt to hot climates?

• Grew more body hair

• Became shorter and wider

• Developed darker skin

• Became taller and narrower

What was the main purpose of the first stone tools?

• Building shelters

• Making clothes

• Starting fires

• Cutting food

How did stone tools change human hunting?

• Made hunting unnecessary

• Only improved fishing

• Made hunting more dangerous

• Made hunting larger animals easier

How did better tools change what early humans could eat?

• No change in diet

• Humans ate only plants

• Humans could only eat fish

• Improved access to meat

How did tool use affect early human populations?

• Caused population decrease

• Had no effect

• Made humans live alone

• Led to population growth