What is the other-feeders and self-feeders for euglenas?

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What organs comprise the respiratory system of a bird

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

Ihave a question. diplontic animals usually produce both eggs or sperm which are :