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Questions and Answers
What percentage of known organisms in the animal kingdom are invertebrates?
What percentage of known organisms in the animal kingdom are invertebrates?
Which of the following is NOT a characteristic of Porifera?
Which of the following is NOT a characteristic of Porifera?
How do Coelenterates primarily capture their prey?
How do Coelenterates primarily capture their prey?
What is the primary method by which worms breathe?
What is the primary method by which worms breathe?
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Which feature distinguishes Coelenterates from Porifera?
Which feature distinguishes Coelenterates from Porifera?
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What do some Porifera produce as a defense mechanism?
What do some Porifera produce as a defense mechanism?
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What is a common habitat for worms?
What is a common habitat for worms?
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Which group do jellyfish belong to?
Which group do jellyfish belong to?
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What physical characteristic is common to worms?
What physical characteristic is common to worms?
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How do sponges primarily obtain food?
How do sponges primarily obtain food?
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What type of reproduction can mollusks perform?
What type of reproduction can mollusks perform?
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Which of the following is a common characteristic of arthropods?
Which of the following is a common characteristic of arthropods?
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Which of these mollusks is an example of one that has no external shell?
Which of these mollusks is an example of one that has no external shell?
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How do mollusks that live in water typically move?
How do mollusks that live in water typically move?
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Which of the following is true about the vision of arthropods?
Which of the following is true about the vision of arthropods?
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What is the primary component of echinoderm skin?
What is the primary component of echinoderm skin?
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What are the main subgroups of arthropods?
What are the main subgroups of arthropods?
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Which of the following accurately describes the body structure of most arthropods?
Which of the following accurately describes the body structure of most arthropods?
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What is the main way echinoderms move?
What is the main way echinoderms move?
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Which group of animals primarily inhabits aquatic environments?
Which group of animals primarily inhabits aquatic environments?
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Study Notes
Invertebrates
- Invertebrates make up 95% of known organisms in the animal kingdom
- They lack a backbone and are divided into six groups
Porifera (Sponges)
- Simple organisms; resemble plants
- Lack tissues, organs, brains, blood, or muscles
- Aquatic (freshwater or saltwater)
- Immobile adults
- Covered in pores to filter water for food and oxygen
- Some produce toxins for protection
Coelenterates (Sea Anemones, Fan Coral)
- Aquatic invertebrates (mostly marine)
- Central opening surrounded by tentacles for feeding
- Simple nervous system
- Reproduce sexually or asexually
- Many produce toxins for protection
- Examples include jellyfish, sea anemones, and corals
Worms
- Invertebrate animals with long, soft bodies
- Some divided into rings
- No limbs, move by contracting/sliding
- Live in various environments (underground, water, humid places)
- Breathe through their skin
- Important in soil ecosystems by eating decaying matter
Mollusks (Slugs, Squid)
- Soft bodies; some have hard shells for protection
- Live on land and in the sea
- Examples include clams, snails, and squids
- Some have one shell, some two
- Some have no shell (like slugs)
Arthropods
- Around 75% of all animals
- Exoskeleton for protection
- Bodies divided into parts (legs, antennae, etc.)
- Cold-blooded
- Many have good eyesight and/or hearing
- Important subgroups: insects, arachnids, crustaceans, and myriapods
- Insects (6 legs, 2 antennae)
- Arachnids (8 legs, no antennae)
- Crustaceans (strong shell, 10 legs)
- Myriapods (many legs)
Echinoderms (Starfish, Sea Urchins)
- Star-shaped, round, or other forms
- Live in water
- No distinguishable head
- Have small feet for movement
- Internal skeleton of calcareous plates
- Reproduce sexually
- Approximately 7000 species exist
- No heart or blood; move using arms
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Description
Test your knowledge on invertebrates, the fascinating group of animals that make up 95% of known species without backbones. Explore their diverse characteristics, classifications, and habitats, including sponges, sea anemones, worms, and mollusks. Perfect for biology enthusiasts!
