Explain a higher pitched sound in terms of a wave length

Select the word from the list that best fits the definition a system made of 25 satellites

What are potential sources of error in marta’s experiment

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