Kingdom Animalia Invertebrates Review

A sponge belongs to the phylum Porifera. Porifera is a phylum of simple multicellular organisms that lack true tissues and organs. Sponges are filter feeders that live in aquatic environments, and they have a porous body structure with specialized cells called choanocytes that help them filter and circulate water. They are considered the simplest and most primitive animals, and they play important roles in marine ecosystems.

Cnideria is the correct answer because jellyfish belong to the phylum Cnideria. This phylum includes animals that have specialized stinging cells called cnidocytes, which jellyfish use to capture prey and defend themselves. Other examples of animals in the Cnideria phylum include sea anemones and corals.

Arthropoda is the correct answer because it is the only phylum that includes animals with both an exoskeleton and jointed legs. Echinodermata is incorrect because although it has an exoskeleton, it does not have jointed legs. Platyhelminthes and Mollusca are also incorrect because they do not have an exoskeleton or jointed legs.

A starfish belongs to the phylum Echinodermata. This phylum includes marine animals that have radial symmetry and a water vascular system. Starfish are characterized by their five arms, tube feet, and ability to regenerate lost body parts. They are not part of the phylum Annelida, which includes segmented worms, or the phylum Mollusca, which includes animals like snails and clams. They also do not belong to the phylum Arthropoda, which includes insects and crustaceans.

A clam belongs to the phylum Mollusca. This phylum includes animals with soft bodies, usually protected by a hard shell. Clams have a two-part shell and are classified as bivalve mollusks. They are known for their ability to filter feed and live in marine or freshwater environments.

A sessile animal is one that is permanently attached to a surface and does not move around. Among the given options, a sponge is the only animal that fits this description. Sponges are filter-feeding organisms that attach themselves to surfaces such as rocks or coral reefs. They do not have the ability to move from one place to another, making them sessile. In contrast, starfish, shrimp, and earthworm are all capable of movement and are not considered sessile animals.

A spider is most closely related to a scorpion because both belong to the class Arachnida. They share similar characteristics such as having eight legs and two body segments. Additionally, spiders and scorpions both have venomous glands and use their pedipalps for capturing prey. While beetles, crabs, and ants are also arthropods, they belong to different classes and are not as closely related to spiders as scorpions are.

All of the animals listed in the question (butterflies, millipedes, lobsters) belong to the phylum Arthropoda, which is characterized by having jointed legs and a segmented body. However, snails belong to the phylum Mollusca, not Arthropoda. Mollusks have a soft body and typically a hard shell, and they are not classified as arthropods.

A nematode is a type of animal that belongs to the phylum Nematoda, commonly known as roundworms. Therefore, the correct answer is roundworm. Flatworms, leeches, and earthworms belong to different phyla and are not considered nematodes.

Sea cucumber is not a cephalopod in the phylum Mollusca. While octopus, squid, and cuttlefish are all cephalopods, sea cucumbers belong to a different class within the phylum Mollusca called Holothuroidea. Sea cucumbers have a different body structure and feeding habits compared to cephalopods. They are characterized by their elongated, cylindrical bodies and are known for their ability to expel their internal organs as a defense mechanism.

Earthworms belong in the same phylum as leeches because both are classified as members of the phylum Annelida. This phylum is characterized by segmented bodies and a closed circulatory system. While centipedes and flatworms belong to different phyla (Arthropoda and Platyhelminthes, respectively), lancelets belong to the phylum Chordata, which includes vertebrates.

Nautilus is not a Cniderian because it belongs to the class Cephalopoda, which is a group of marine animals that includes squids, octopuses, and cuttlefish. Cniderians, on the other hand, are a group of invertebrate animals that include sea anemones, corals, and jellyfish.

Barnacles belong to the phylum Arthropoda and the order Crustacea. This is because barnacles have jointed appendages and a hard exoskeleton, which are characteristics of arthropods. Additionally, barnacles are crustaceans, a specific group within the phylum Arthropoda that includes animals such as crabs, lobsters, and shrimp. Therefore, the correct answer is Arthropoda, crustaceans.

The correct answer is Cnideria. This is because the question states that something has been dissected from all of the given phyla except for one. The phyla listed are Arthropoda, Annelida, Mollusca, Cnideria, and Echinodermata. The other four phyla (Arthropoda, Annelida, Mollusca, and Echinodermata) have all been dissected, leaving Cnideria as the only phylum that has not been dissected.

Starfish is not a filter feeder. While marine worms, clams, and coral are all filter feeders that obtain their food by filtering water and extracting small particles, starfish are not. Starfish are predators and scavengers, feeding on other animals such as mollusks and small fish. They do not rely on filtering water for their food source.