Answer:

The largest group of invertebrates is the Arthropoda. Arthropods are invertebrates with jointed limbs and exoskeletons made of chitin. The word Arthropoda comes from the Greek words arthron, which means "joint", and pous, which means "foot".

Arthropods have the following features:

• Jointed appendages
• An outside skeleton, or exoskeleton, for protection
• An open circulatory system that does not have real blood as humans do
• Segmented bodies
• A hardened exoskeleton that is periodically shed during growth

Arthropods are divided into four subphyla:

• Myriapoda, including centipedes and millipedes
• Chelicerata, including spiders, scorpions, ticks, and mites
• Crustacea, including crabs

There are an estimated 750,000 species in the phylum Arthropoda. Examples of arthropods include:

Butterflies, Spiders, Millipedes, Centipedes, Crabs, Barnacles, Scorpions, Ticks.

Explanation:

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Answer:

The largest group of invertebrates is the Arthropods. Arthropods are characterized by several features:

1. **Exoskeleton**: Arthropods have a hard exoskeleton made of chitin that covers and protects their bodies. This exoskeleton provides support and prevents desiccation (drying out).

2. **Segmented Bodies**: They have segmented bodies with jointed appendages. These segments are grouped into regions like the head, thorax, and abdomen in insects.

3. **Bilateral Symmetry**: Arthropods exhibit bilateral symmetry, meaning their bodies can be divided into two equal halves along a central axis.

4. **Molting**: They undergo molting or ecdysis, where they shed their exoskeleton to grow. This process is necessary because their exoskeleton doesn't grow with them.

5. **Diverse Habitats**: Arthropods are incredibly diverse and can be found in various habitats, including terrestrial (land), aquatic (freshwater and marine), and even in the air.

6. **Respiration**: They respire through various mechanisms, including gills in aquatic species and tracheal systems in insects.

7. **Sensory Organs**: They have well-developed sensory organs, including compound eyes in many insects and specialized sensory hairs.

8. **Reproduction**: Reproduction varies among arthropods, with most laying eggs, but some giving birth to live young.

Examples of arthropods include insects (e.g., ants, bees, butterflies), arachnids (e.g., spiders, scorpions), crustaceans (e.g., crabs, lobsters), and myriapods (e.g., centipedes, millipedes).