Question

evolutionary theory proposed by charles darwin relies on two central mechanisms: natural selection and

fossils serve as tangible remnants of ancient life, providing valuable clues about our ancestors path.

lucy, a partial skeleton found in ethiopia, revealed a bipedal creature living approximately million years ago.

comparative anatomy reveals striking similarities in the structure of humans and certain primates.

humans have evolved the ability to walk upright on two legs, a unique feature called

the human brain is significantly larger and more complex compared to other primates, enabling advanced abilities.

Explanation:

1. Darwin's evolutionary theory has natural selection and variation as central mechanisms. Variation provides the raw material for natural - selection to act upon.
2. Fossils help trace the evolutionary path of ancestors.
3. Lucy is estimated to be around 3.2 million years old.
4. Comparative anatomy shows skeletal similarities between humans and certain primates.
5. Bipedalism is the ability to walk upright on two legs.
6. The large and complex human brain enables advanced cognitive abilities.

Answer:

1. Variation
2. Evolutionary
3. 3.2
4. Skeletal
5. Bipedalism
6. Cognitive