How are animal populations counted?

Which term describes the number of waves that pass a given point in a given time? crest frequency trough wavelength

How does secondary succession differ from primary succession?

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