Which one of the following criteria is necessary for natural selection to occur? a. individuals have the same adaptations. b. individuals show no variation in fitness levels. c. a struggle for existence is apparent. d. enough resources exist for individuals to survive and thrive

Mike wants to negatively charge a small rubber ball. which of these methods would successfully charge the ball? a) heating the ball in boiling water b) running the ball over a strong magnet c) rubbing the ball back and forth on carpet d) dropping the ball from a tall bulding submit hint forces in nature (s8p5.b) conductors and insulators id: 10402 hint electrons must be transferred.