Aphids are small insects that feed on the sap of phloem vessels in plants and are destructive to crops and garden plants. In order to help control aphids natrually, farmers and gardeners will introduce ladybugs that eat aphids as their food source. What type of relationship exists between the aphid and the ladybug?

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