Can someone help me with this?

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

The result of saul's disobedience was1. samuel became the next king in place of saul.2. agag, the king of the amalekites broke free and killed saul.3. the lord rejected saul from being king.4. he was sent to live with jesse in bethlehem.plz plz

How do energy and matter move through an ecosystem? both energy and matter unidirectionally flow through an ecosystem. both energy and matter cycle within an ecosystem. matter unidirectionally flows through an ecosystem, whereas energy cycles within an ecosystem. energy unidirectionally flows through an ecosystem, whereas matter generally cycles within an ecosystem.