Lesson 3 - Introduction to Invertebrates
Introduction
An estimated 97% of animal species are invertebrates! Insects, annelids, mollusks, echinoderms, protozoa, crustaceans, and arachnids are all invertebrates. Invertebrates vary widely in size, from microscopic mites to the colossal squid, which can reach 30 – 33 feet in size and have tentacles that stretch to over 100 feet long! Many invertebrates spend at least some part of their life in water. However, some groups of invertebrates live solely on land. Common examples include worms, insects, snails, and spiders. Most invertebrates change form as they grow, going through a process known as metamorphosis. So far, more than 1.25 million species have been identified/described, most of which are insects. But scientists are continuing to discover and describe more every year!
Invertebrates
In your Science Journal:
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- Write down today’s Lesson Title at the top of your next Journal page.
- Write today’s learning objective on the first line.
- Explore the Module 4 - Lesson 3 presentation below. Today, we’ll learn about a huge number of species that make up invertebrates. We’ll be exploring a Google Slides presentation about the different types of invertebrates that exist. It is a presentation that will help you understand the characteristics of invertebrates.
- Write down the important terms and their definitions (yellow boxes) in your science journal.
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