2. which pair of structures are homologous?
a. wing of an insect and wing of a bird
b. tentacle of a hydra and flipper of a whale
c. front leg of an insect and bones in the leg of a human
d. bones in the front leg of a dog and bones in the wing of a bat

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.