2 Points
A species of fish is introduced into a lake. The fish is better at hunting for
food than the old fish. The old fish die off, and the new fish population
increases. Which is the best way to describe these fish in the new
ecosystem?
A. Keystone species
B. Native species
C. Invasive species
D. Cyclical species

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous