OCS FINAL EXAM WITH ALL CORRECT & 100% VERIFIED
ANSWERS|ACTUAL COMPLETE EXAM|ALREADY
GRADED A+
Invertebrates ✔Correct Answer-Soft-bodied, no rigid internal structure.
Phylum Porifera ✔Correct Answer-Invertebrate. Simplest multicellular organisms. NO true tissues
or organs. Sessile. Suspension feeders. Sponges.
Phylum Cnidaria ✔Correct Answer-Invertebrate. Specialized tissues. Stinging cells. Radial
symmetry. 2 possible body forms (polyp and medusa, asexual and sexual respectively). Jellyfish,
corals, sea anemones.
Class Hydrozoa ✔Correct Answer-Invertebrate. Within phylum cnidaria. Diverse body forms.
Portuguese Man-o-war
Class Scyphozoa ✔Correct Answer-Invertebrate. Within phylum cnidaria. Large, medusa stage
dominant.
Class Anthozoa ✔Correct Answer-Invertebrate. Within phylum cnidaria. Solitary or colonial polyps.
Lack medusa stage. Corals, sea anemones
Phylum Ctenophora ✔Correct Answer-Invertebrate. Entirely planktonic, marine. Radial symmetry.
Colloblasts (sticky cells for capturing prey). 8 bands of cilia for propulsion.
Phylum Platyhelminthes ✔Correct Answer-Invertebrate. 3 classes: Turbellaria, Tremetoda, Cestoda
Class Turbellaria ✔Correct Answer-Invertebrate. Mainly benthic. Dorso-ventrally flattened.
Simplest organisms with tissues organized as organs. Central nervous system. One-way gut.
Class Tremetoda ✔Correct Answer-Invertebrate. Flukes.
Class Cestoda ✔Correct Answer-Invertebrate. Tapeworms
Phylum Nematoda ✔Correct Answer-Invertebrate. Round worms. Free living and parasitic.
Phylum Nemertea ✔Correct Answer-Invertebrate. Pseudocoelomates. Circulatory system.
Complete gut. Longest invertebrate. Predatory.
Coelomates ✔Correct Answer-Invertebrate. Possess a true coelom (body cavity). Digestive tract
separate from body wall.
Phylum Annelida ✔Correct Answer-Invertebrate. Various feeding strategies. Coelomate. Class
Polychaeta.
Phylum Molluska ✔Correct Answer-Invertebrate. Coelomates. Classes: Gastropoda, Bivalvia,
Cephalopoda
Class Gastropoda ✔Correct Answer-Invertebrate. Coelomate. Within phylum molluska. Coiled
organs, spiral shell. Snails.
, Class Bivalvia ✔Correct Answer-Invertebrate. Coelomate. Within phylum molluska. Laterally
compressed. Shell with 2 halves. Siphons bring water into mantle cavity. Clams, oysters, scallops.
Class Cephalopoda ✔Correct Answer-Invertebrate. Coelomate. Within phylum molluska. Complex
nervous system. Highly motile. Reduced or loss of shell. Siphon modified for locomotion. Octopus,
squid
Phylum Anthropoda ✔Correct Answer-Invertebrate. Coelomate. Largest animal phyla. Bilateral
symmetry. Segmented, jointed appendages. Exoskeleton made of chitin.
Class Crustacea. ✔Correct Answer-Invertebrate. Within phylum anthropoda. Specialized
appendages. 2 pairs senory antennae. Decapods--have 10 legs, complext mouthparts, abdomen and
cephalothorax. Horseshoe crabs
Phylum Echinodermata ✔Correct Answer-Invertebrate. Radial symmetry. Larvae often bilaterally
symmetric. Sea stars, sea urchins, sea cucumbers
Chordates ✔Correct Answer-Most advanced animals. Possess: notocords, tubular dorsal nervous
system, gills at some point in life
Phylum Urochordata ✔Correct Answer-Invertebrate. Tunicates
Phylum Cephalochordata ✔Correct Answer-Invertebrate. Laterally compressed, transition
organism between inverts and verts. Lancelets
Class Agnatha ✔Correct Answer-Vertebrate. Jawless fish. Eel-like bodies. Scavengers, predators.
Lampreys and hagfish
Class Condrichthyes ✔Correct Answer-Vertebrate. Cartilage skeleton. Sharks, skates, rays, ratfishes.
Lack true scales (have denticles instead). Very old, successful group. Largest members eat plankton.
Sensory perception.
Class Osteichthyes ✔Correct Answer-Vertebrate. Bony fish. Thin, flexible scales. May have swim
bladder organ. Body shape affect friction. Coloration. Diverse feeding strategies, mainly carnivorous
Marine reptiles ✔Correct Answer-Cold blooded. Tropical and sub-tropical. Must lay eggs on land.
Sea turtles, sea snakes, marine iguana, saltwater crocodiles
Marine mammals ✔Correct Answer-3 orders: Carnivora, sirenia, cetacea
Order Carnivora ✔Correct Answer-Need land to rest and breed. Most cold water, have blubber.
Seals (move with front flippers, no external ear flap), sea lions (external ear flap, can move with all
four limbs), walruses (tusks, feed on benthic inverts), sea otters (pacific coast, lack blubber, have
thick fur, use tools)
Order Cetaceans ✔Correct Answer-Largest group of marine mammals, warm-blooded, entire life in
water, nostrils=blowhole, suborder odontoceti (toothed whales, feed on fish and squid, 1 blowhole),
suborder mysticeti (baleen whales, feed on plankton, 2 blowholes, largest marine mammals)
ANSWERS|ACTUAL COMPLETE EXAM|ALREADY
GRADED A+
Invertebrates ✔Correct Answer-Soft-bodied, no rigid internal structure.
Phylum Porifera ✔Correct Answer-Invertebrate. Simplest multicellular organisms. NO true tissues
or organs. Sessile. Suspension feeders. Sponges.
Phylum Cnidaria ✔Correct Answer-Invertebrate. Specialized tissues. Stinging cells. Radial
symmetry. 2 possible body forms (polyp and medusa, asexual and sexual respectively). Jellyfish,
corals, sea anemones.
Class Hydrozoa ✔Correct Answer-Invertebrate. Within phylum cnidaria. Diverse body forms.
Portuguese Man-o-war
Class Scyphozoa ✔Correct Answer-Invertebrate. Within phylum cnidaria. Large, medusa stage
dominant.
Class Anthozoa ✔Correct Answer-Invertebrate. Within phylum cnidaria. Solitary or colonial polyps.
Lack medusa stage. Corals, sea anemones
Phylum Ctenophora ✔Correct Answer-Invertebrate. Entirely planktonic, marine. Radial symmetry.
Colloblasts (sticky cells for capturing prey). 8 bands of cilia for propulsion.
Phylum Platyhelminthes ✔Correct Answer-Invertebrate. 3 classes: Turbellaria, Tremetoda, Cestoda
Class Turbellaria ✔Correct Answer-Invertebrate. Mainly benthic. Dorso-ventrally flattened.
Simplest organisms with tissues organized as organs. Central nervous system. One-way gut.
Class Tremetoda ✔Correct Answer-Invertebrate. Flukes.
Class Cestoda ✔Correct Answer-Invertebrate. Tapeworms
Phylum Nematoda ✔Correct Answer-Invertebrate. Round worms. Free living and parasitic.
Phylum Nemertea ✔Correct Answer-Invertebrate. Pseudocoelomates. Circulatory system.
Complete gut. Longest invertebrate. Predatory.
Coelomates ✔Correct Answer-Invertebrate. Possess a true coelom (body cavity). Digestive tract
separate from body wall.
Phylum Annelida ✔Correct Answer-Invertebrate. Various feeding strategies. Coelomate. Class
Polychaeta.
Phylum Molluska ✔Correct Answer-Invertebrate. Coelomates. Classes: Gastropoda, Bivalvia,
Cephalopoda
Class Gastropoda ✔Correct Answer-Invertebrate. Coelomate. Within phylum molluska. Coiled
organs, spiral shell. Snails.
, Class Bivalvia ✔Correct Answer-Invertebrate. Coelomate. Within phylum molluska. Laterally
compressed. Shell with 2 halves. Siphons bring water into mantle cavity. Clams, oysters, scallops.
Class Cephalopoda ✔Correct Answer-Invertebrate. Coelomate. Within phylum molluska. Complex
nervous system. Highly motile. Reduced or loss of shell. Siphon modified for locomotion. Octopus,
squid
Phylum Anthropoda ✔Correct Answer-Invertebrate. Coelomate. Largest animal phyla. Bilateral
symmetry. Segmented, jointed appendages. Exoskeleton made of chitin.
Class Crustacea. ✔Correct Answer-Invertebrate. Within phylum anthropoda. Specialized
appendages. 2 pairs senory antennae. Decapods--have 10 legs, complext mouthparts, abdomen and
cephalothorax. Horseshoe crabs
Phylum Echinodermata ✔Correct Answer-Invertebrate. Radial symmetry. Larvae often bilaterally
symmetric. Sea stars, sea urchins, sea cucumbers
Chordates ✔Correct Answer-Most advanced animals. Possess: notocords, tubular dorsal nervous
system, gills at some point in life
Phylum Urochordata ✔Correct Answer-Invertebrate. Tunicates
Phylum Cephalochordata ✔Correct Answer-Invertebrate. Laterally compressed, transition
organism between inverts and verts. Lancelets
Class Agnatha ✔Correct Answer-Vertebrate. Jawless fish. Eel-like bodies. Scavengers, predators.
Lampreys and hagfish
Class Condrichthyes ✔Correct Answer-Vertebrate. Cartilage skeleton. Sharks, skates, rays, ratfishes.
Lack true scales (have denticles instead). Very old, successful group. Largest members eat plankton.
Sensory perception.
Class Osteichthyes ✔Correct Answer-Vertebrate. Bony fish. Thin, flexible scales. May have swim
bladder organ. Body shape affect friction. Coloration. Diverse feeding strategies, mainly carnivorous
Marine reptiles ✔Correct Answer-Cold blooded. Tropical and sub-tropical. Must lay eggs on land.
Sea turtles, sea snakes, marine iguana, saltwater crocodiles
Marine mammals ✔Correct Answer-3 orders: Carnivora, sirenia, cetacea
Order Carnivora ✔Correct Answer-Need land to rest and breed. Most cold water, have blubber.
Seals (move with front flippers, no external ear flap), sea lions (external ear flap, can move with all
four limbs), walruses (tusks, feed on benthic inverts), sea otters (pacific coast, lack blubber, have
thick fur, use tools)
Order Cetaceans ✔Correct Answer-Largest group of marine mammals, warm-blooded, entire life in
water, nostrils=blowhole, suborder odontoceti (toothed whales, feed on fish and squid, 1 blowhole),
suborder mysticeti (baleen whales, feed on plankton, 2 blowholes, largest marine mammals)
