Si tienen duda me preguntan, pero por favor ayuda

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects