In what ways are the invertebrates useful?

Here are some of the helpful things invertebrates do:

• Bees pollinate plants, which provide food and oxygen for all living things
• Fossilized invertebrate skeletons are used in cleaning products
• Spiders kill pests that might cause diseases
• Sponges are used in cleaning
• Horseshoe crabs create chemicals used in medicine
• Many insects serve as food for other animals