Scientists group organisms into kingdoms by looking at specific characteristics. which is a characteristic of a carrot plant

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

Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?

The structure of cells has changed significantly overtime. what concept explains the presence of mitochondria in cells?