What triggers metamorphosis?

What are pores and where are pores on a sponges body? What are the 4 basic needs of plants? What hook is recommended for culprit worms? Does the cog defeat the locust? How much does a CPC holder make? How much does a whirligig beetle weigh? Where do gnat eggs come from? What is dicchride? Is it possible for a centipede to trip? How do sponges replace missing parts? What does pond weed look like? Where is an arachnids ecosystem? How are seashell important to the environment? How do you get rid of a fly infestation in your home if the cause is unknown? Will caulking around electrical outlets and baseboards do any good to stop potential bedbugs from commuting between townhomes or apartments? Is spider silk a carbohydrate? What animals dig holes in backyard? What is the name for animal that eat termites? What kingdom is parasitic? Do praying mantises eat frogs?