Arthropods
Arthropods are the largest phylum in the animal kingdom, comprising over 80% of all known living animal species. This diverse group includes insects, spiders, crustaceans, and centipedes. Arthropods are characterized by their jointed limbs, segmented bodies, and exoskeleton made of chitin. They play crucial roles in ecosystems as decomposers, pollinators, and predators.
Characteristics of Arthropods
- Jointed limbs
- Segmented bodies
- Exoskeleton made of chitin
- Bilateral symmetry
- Open circulatory system
- Well-developed nervous system
Types of Arthropods
There are four main groups of arthropods:
- Insects: The largest group of arthropods, with over a million described species. They have three body segments and six legs.
- Arachnids: This group includes spiders, scorpions, ticks, and mites. They have two body segments and eight legs.
- Crustaceans: Examples include crabs, lobsters, shrimp, and barnacles. They have two pairs of antennae and biramous (two-branched) appendages.
- Myriapods: This group includes millipedes and centipedes. They have elongated bodies with many segments and multiple legs per segment.
Importance of Arthropods
Arthropods play vital roles in ecosystems:
- As pollinators, such as bees and butterflies
- As decomposers, breaking down organic matter
- As food sources for other animals
- As vectors for disease transmission
Study Guide
When studying arthropods, it's important to focus on their characteristics, diversity, and ecological roles. Here are some key points to remember:
- What are the defining characteristics of arthropods?
- List the four main groups of arthropods and provide examples of each.
- Explain the ecological importance of arthropods in various ecosystems.
- Discuss the impact of arthropods on human societies, both positive and negative.
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The Living Environment: Students understand that cells are the basic unit of life, that all life as we know it has evolved through genetic transfer and natural selection to create a great diversity of organisms, and that these organisms create interdependent webs through which matter and energy flow. Students understand similarities and differences between humans and other organisms and the interconnections of these interdependent webs.
Cells: Students describe how living things are made up of one or more cells and the ways cells help organisms meet their basic needs.
Give examples of organisms that consist of a single cell and organisms that are made of a collection of cells.