What purpose does the endosperm serve in the seed?

Why do oceanic plates tend to subduction when colliding with a continental plate

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

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