Using context clues , what does predecessors mean as it is used in the first paragraph

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Brian made this table to organize his notes on changes of state change of state energy change melting gain freezing lose deposition gain condensation lose

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