Which statement best describes vestigial structures a. all animals have them b. they are necessary for an organisms survival c. they contain genetic mutations d. they may have had an important function in the past.

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

Anonnative species is best described as a species that a. does not normally live in an area b. has no permanent home c. is a poor predator d. increase biodiversity

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees