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Questions and Answers
Mollusks can reproduce both sexually and asexually.
Mollusks can reproduce both sexually and asexually.
True (A)
All mollusks have a very hard external shell.
All mollusks have a very hard external shell.
False (B)
Arthropods are cold-blooded and can live on land or in water.
Arthropods are cold-blooded and can live on land or in water.
True (A)
Echinoderms typically have a soft and smooth surface.
Echinoderms typically have a soft and smooth surface.
Arthropods have more than two antennae.
Arthropods have more than two antennae.
Starfish are a type of echinoderm.
Starfish are a type of echinoderm.
Mollusks that live in the water typically move by crawling.
Mollusks that live in the water typically move by crawling.
Invertebrates make up 95 percent of known organisms in the animal kingdom.
Invertebrates make up 95 percent of known organisms in the animal kingdom.
Sponges are classified as vertebrates due to their complex body structure.
Sponges are classified as vertebrates due to their complex body structure.
Coelenterates possess a simple nervous system despite lacking a brain.
Coelenterates possess a simple nervous system despite lacking a brain.
Most worms are known to have limbs that help them move.
Most worms are known to have limbs that help them move.
Worms are beneficial to agriculture due to their ability to decompose organic matter.
Worms are beneficial to agriculture due to their ability to decompose organic matter.
Some coelenterates can be fatal if touched due to their toxic nature.
Some coelenterates can be fatal if touched due to their toxic nature.
Porifera can live both in freshwater and saltwater environments.
Porifera can live both in freshwater and saltwater environments.
Worms breathe through their lungs.
Worms breathe through their lungs.
Flashcards
Invertebrates: What are they?
Invertebrates: What are they?
Invertebrates are animals without a backbone. They make up a large portion of the animal kingdom, roughly 95% of known animals.
Sponges (Porifera): Body structure?
Sponges (Porifera): Body structure?
Sponges have a simple body structure with no tissues or organs. They are covered in pores for water and oxygen intake.
Sponges (Porifera): Environment?
Sponges (Porifera): Environment?
Sponges live in aquatic environments, including both fresh and saltwater.
Coelenterates: Feeding method?
Coelenterates: Feeding method?
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Worms: Movement?
Worms: Movement?
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Worms: Role in soil?
Worms: Role in soil?
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Coelenterates: Toxins?
Coelenterates: Toxins?
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Worms: Breathing?
Worms: Breathing?
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Mollusks: Habitat?
Mollusks: Habitat?
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Mollusks: Unique Feature?
Mollusks: Unique Feature?
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Mollusks: How do they move?
Mollusks: How do they move?
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Arthropods: What makes them unique?
Arthropods: What makes them unique?
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Arthropods: Subgroups?
Arthropods: Subgroups?
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Echinoderms: What are they?
Echinoderms: What are they?
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Echinoderms: Name origin?
Echinoderms: Name origin?
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Study Notes
Invertebrates
- Invertebrates make up 95% of known organisms in the animal kingdom.
- They lack a backbone.
- They are divided into six groups.
Porifera (Sponges)
- Simple organisms, resembling plants.
- Lack tissues, organs, brains, heads, blood, and muscles.
- Aquatic (freshwater and saltwater).
- Sessile as adults, but larvae are mobile.
- Obtain food and oxygen from water through pores.
- Some produce toxins for protection.
Coelenterates (e.g., sea anemones, corals)
- Aquatic, mostly marine invertebrates.
- Central body opening, surrounded by tentacles for trapping prey.
- Simple nervous system.
- Reproduce sexually or asexually.
- Many produce toxins for protection.
Worms
- Invertebrate animals with long, soft bodies.
- Some have segmented bodies.
- No limbs; move by sliding or contracting.
- Found in various environments (underground, water, humid places).
- Breathe through their skin.
- Important to soil ecosystem as decomposers.
- Reproduce sexually or asexually.
Mollusks (e.g., slugs, squid)
- Soft-bodied invertebrates, often with a hard shell (some have no shell).
- Some live on land, some in water.
- Examples include clams, snails, and squids.
- Some have a hard external shell for protection.
Arthropods
- Largest group of animals (around 75% of all animals).
- Characterized by an exoskeleton (hard outer shell).
- Body divided into segments.
- Jointed appendages (legs, antennae, wings).
- Cold-blooded.
- Four subgroups: Insects, Arachnids, Crustaceans, and Myriapods.
Insects
- Usually have six legs, two antennae, and eyes.
- Examples: wasps, beetles, butterflies.
- Some produce toxins (e.g., bees).
Arachnids
- Eight legs, no antennae.
- Examples: scorpions, spiders, ticks.
- Some are venomous.
Crustaceans
- Mostly live in water.
- Body divided into cephalothorax and abdomen.
- Examples: lobsters, shrimp, crabs.
- Some have pincers for defense/food.
Myriapods
- Many legs, two antennae.
- Examples: centipedes, millipedes.
- Some are venomous.
Echinoderms (e.g., starfish, sea urchins)
- Star or round shape.
- No distinct head.
- Have small feet for movement on the sea floor.
- Internal calcareous skeleton (made of calcium carbonate).
- Live in water.
- Reproduce sexually.
- Examples: starfish, sea urchins, sea cucumbers.
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