Classify the following as either a specific or a nonspecific defense of the body's immune system.

• skin
• macrophages
• bacteria • mucous
• fever
• b cells • t cells
• antibodies

specific nonspecific

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

Abiologist counts the number of rabbits in a population each year and observes a decrease in population. since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. which describes the biologist’s actions? a.) experimentationb.) inferencec.) observationd.) interacting