When paleontologists conduct investigations to answer questions about fossils, they need to _______________ before making a valid conclusion.

How does a high level of sediment in water reduce the quality for aquatic life?

Why are non-native plants a threat to native plants?

What effect does excess nitrogen, a nutrient found in fertilizer that is carried by runoff into bodies of water, have on organisms in a pond or lake ecosystem?

Rabbits with light fur outnumber rabbits with dark fur because rabbits with light fur

How would an increase in the number of caterpillars that eat the leaves off of trees affect an environment?

A species lives in a particular environment. Which of the following statements best describes the environment that the species lives in and how the species will look over thousands of years? The environment will

Environmental scientists conduct investigations to learn about the environment. Which method helps reduce bias during an investigation?

Removing trees from a habitat changes the area for many species by

Using wind turbines instead of burning coal positively affects the environment by

Which of the following best explains the presence of a sea-life fossil in the rock on top of a mountain?

A fossil found in one rock layer is of the same species as a fossil found in a deeper rock layer. Why are the two fossils slightly different in structure?

What is the result of rock layers being folded upwards?

**Sedimentary rock layers tell us everything about the history of the fossil record except

***What is true about deep layers of sedimentary rock and how they may change over time?

***The introduction of a non-native plant negatively affects an environment in every way except?

Why do non-native plants threaten native plants?

What most likely happened to a species that is found in the fossil record but have no living members?

Over time, organisms evolve from a common ancestor. Which process best explains why they now have different characteristics?

What is the best evidence that the surface of Earth has changed over time?

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