If You Play with a Living Anemone with a Probe,it

question 11

Multiple Choice

If you play with a living anemone with a probe,it will withdraw even if you vibrate the probe like prey would vibrate; it also withdraws if you just add sugar.However,it reaches out and grasps an object that both vibrates and tastes like food.The use of such a double system prevents unnecessary firing of expensive nematocysts.Why are nematocysts "expensive"?

• A)The organism dies without nematocysts.
• B)The research equipment to detect them is very expensive.
• C)Nematocysts are used in medicine and are very expensive to harvest.
• D)The nematocyst is very complex and most likely costs the anemone much energy to build.
• E)The nematocyst can only be used for food and doesn't "fire" for non-food objects.