What is a a species?

Why is adaptation beneficial?

How are some organisms adapted to their environment?

How do these adaptations help the species to survive?

What do living organisms depend on for their survival?

How may an environment change, causing a species to become extinct?

What are most organisms dependent on?

When plants absorb energy from the Sun for photosynthesis, where is it stored?

How is energy transferred between organisms in an ecosystem?

How does energy pass out of a food chain?

How do you calculate the percentage efficiency of energy transfer?

How is carbon recycled through the environment?

Explain what happens when nitrogen compounds are converted to proteins.

How are nitrogen compounds transferred through food chains?

How are nitrates released into the soil?

What is nitrogen fixation?

How can environmental change be measured using non-living indicators?

How can environmental change be measured using living indicators?

When did life on Earth begin?

What did life on Earth evolve from?

What is genetic variation the results of?

How can new characteristics be passed on?

How does natural selection occur?

What are the similarities between natural selection and selective breeding?

What are the differences between natural selection and selective breeding?

What is evidence for evolution provided by?

Why is Darwin's theory of evolution a better explanation than Lamarck's?

How are organisms classified?

How are organisms classified at different levels?

Why is the classification of living organisms useful?

What is biodiversity?

Why is biodiversity important?

What is sustainability?

Why is large-scale monoculture crop production not sustainable?