In a food web, arrows poinet in just one direction beacsue the show what?

Me with biology endocrine system crossword also image left i need with hw

Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.

Describe the structure of a phospholipid