Give one example of each type of symbiosis (Mutualism, Parasitism, and Commensalism) and explain how the organism is benefitted or harmed

Me the formula cacl2 represents the compound

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

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic