The answer could possibly be natural selection or survival of the fittest
Answer:
Observation and measurements recorded during an experiment. All the variables that are kept the same throughout the experiment so they will not affect the results of the experiment. independent Variable. The variable which the experimenter changes so that he/she can observe the results of the experiment.
Increased gill surface area has allowed the cichlids to better absorb the limited oxygen in the water.
I hope it help and if it did :))))))
Answer:
Oxygen or Glucose
Explanation:
Oxygen and glucose are both reactents in cellular respiration.