Question

read the sentences below, filling in the blanks with items from this list. each item will be used once.
genetic variation
isolation
oscillations
cognitive
1.2
development
bipedalism
bone
evolutionary
epochs

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.
the earths history is divided into eras, periods, and
__________
__________ between ice ages and
warmer periods impacted the distribution of flora and
fauna, forcing early humans to adapt.
geological events, such as the formation of barriers like
mountain ranges or oceans, led to
__________ among populations.
understanding human evolution within the context of
geological time helps us appreciate the gradual and
dynamic nature of our species

Explanation:

• For the first blank: Darwin's evolutionary theory has natural selection and genetic variation as central mechanisms.
• For the second blank: Fossils show the evolutionary path of ancestors.
• For the third blank: Lucy is about 3.2 million years old.
• For the fourth blank: Comparative anatomy looks at bone structures.
• For the fifth blank: Walking upright is bipedalism.
• For the sixth blank: The brain's complexity enables cognitive abilities.
• For the seventh blank: Earth's history has eras, periods, and epochs.
• For the eighth blank: Oscillations (changes) between climate periods affected flora/fauna.
• For the ninth blank: Barriers lead to isolation among populations.
• For the tenth blank: Understanding evolution in geological time shows the evolutionary nature.

Answer:

1. genetic variation
2. evolutionary
3. 3.2
4. bone
5. bipedalism
6. cognitive
7. epochs
8. Oscillations
9. isolation
10. evolutionary