What two plant traits did luther burbank try to combine in his crosses?

Explain how scientists use geologic time to determine the age of landforms.

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

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