Which best help scientists to estimate the age of Earth?

How do scientists know that some mountains were once at the bottom of an ocean?

Which is a product of biotechnology?

Which scientific field is responsible for developing medicines that fight against infectious diseases?

How does water availability affect population size?

Which is an example of a decomposer?

Which characteristic would provide the best evidence that species of livings crabs and lobsters are related to extinct trilobite species?

Which statement best describes most of the species that have lived on Earth?

Which best describes why sunlight is important for the survival of green plants?

Which best explains the process of digestion?

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