Explain the impact and spatial variations on survival challenges

Diagram of the evolution of land plants?

Why zebra fish experience similar genetic disease as human

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?