Among 15- to 24-year-olds in the united states, suicide ranks on the list of causes of death. a. first b. third c. fifth d. eighth

Natural selection involves changes in the genetic makeup of a population over a period of time. the random change of dna from parent to offspring, called mutations, can produce variations in offspring. some mutations can be , while others can be harmful. in this experiment, students modeled random mutations. data was collected to determine if the mutations were or harmful when trying to collect and eat food.