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Why can classification systems change over time?

What do evolution trees show?

Give three difficulties in classifying organisms into species and explain each

What is a binomial name?

What is each part? Give an example

Why is the binomial system important?

Why could two species with a recent common ancestor appear very different?

In a food chain, how much energy is lost with every trophic level?

Why are pyramids of numbers and biomass used?

Why might a pyramid of numbers and a pyramid of biomass for the same food chain be different shapes?