Why do birds fly? and also how to get rid of scariness of birds?

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Closing romer’s gap. what is the significance of the new fossil evidence found in scotland? answer in claim evidence and reasoning