Which of the following statements are true? -Elements combine to form compounds
-Chemical formulas show the elements that
makeup a compound
-Elements are substances that cannot be broken
down into anything smaller.
-The subscripts in a chemical formula tell us how
many atoms of each element are in a compound
-All of the above

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.