Ecosystems can be changed by natural events or by human actions. which is not a natural event? a. a forest fire started by lightning b. pollution from a factory entering a river c. a beaver building a dam in a river d. an earthquake

Blood made up of red and white blood cells work together to form

What macromolecule is produced during translation? a. carbohydrate b. rna c. dna d. protein

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?