8th grade Science EOG Review Part 1

Front

What is the theory of evolution?

Back

The theory of evolution explains how species change over time through processes like natural selection and genetic variation.

Front

What is the law of superposition?

Back

The law of superposition states that in undisturbed layers of rock, the oldest layers are at the bottom and the youngest are at the top.

Front

How do mutations affect genetic variation?

Back

Mutations are changes in DNA that can introduce new traits, increasing genetic variation within a population.

Front

What evidence supports the theory that mountains were once underwater?

Back

Fossils of marine organisms found on top of mountains suggest that these mountains were once at the bottom of the ocean.

Front

How does environmental change lead to genetic variation?

Back

Environmental changes can create new challenges, leading to adaptations in species, such as color changes in animals to blend with their surroundings.

Front

Why did mammals become dominant after the mass extinction of dinosaurs?

Back

Mammals had traits that allowed them to adapt to new environments, which helped them survive and thrive after the extinction event.

Front

What is genetic variation?

Back

Genetic variation refers to the differences in DNA among individuals within a population, which can affect traits and survival.

Front

What role do fossils play in understanding evolution?

Back

Fossils provide evidence of past life forms and their changes over time, helping scientists understand the process of evolution.

Front

What is natural selection?

Back

Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring.

Front

How can environmental factors influence evolution?

Back

Environmental factors, such as climate and food availability, can drive natural selection, leading to adaptations in species.