Scientists determind that specific agents produce specific diseases, and many are transmitted by sneezing. What must the droplets contain for a disease to be transmitted by sneezing

A. the disease causing particles
B. cells exposed to the disease
C. toxins released by cells
D. disease specific antibodies

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.