Select the correct answer from each drop-down menu. The numerous chemical reactions that occur in living cells can be disrupted if conditions are too acidic or too basic. Cells are equipped to counteract such changes with substances called , which can neutralize acidic or basic compounds that enter the system. This response keeps the cells in an optimum
range, where life functions can be carried out most effectively.

first box: chemotaxis, carbohydrates, buffers
second box: temperature, phototaxis, ph