Internal Parasites in Biology

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Which of the following is a characteristic feature of animals based on the text?

Asymmetrical structure with no pattern or symmetry (correct)

Asymmetrical structure with clear front and back

Bilateral symmetry with no clear differentiation of sides

Radial symmetry with no distinct front or back

What is the estimated number of living animal species as per the text?

6.8 million

1.4 million (correct)

3.2 million

600,000

When did animal evolution begin according to the text?

approximately 1 billion years ago

around 200 million years ago

1 million years ago

over 600 million years ago (correct)

Which group of organisms shows examples of both sexual and asexual reproduction based on the text?

Fish, amphibians, and reptiles Signup and view all the answers

What distinguishes bilateral symmetry from radial symmetry in animals?

Having left and right halves that are mirror images Signup and view all the answers

Which kingdom do animals belong to according to the text?

Animalia Signup and view all the answers

Which phylum includes animals with radial or biradial symmetry and are diploblastic?

Cnidaria Signup and view all the answers

Which group of animals contains cnidocytes?

Sponges Signup and view all the answers

Which class is NOT part of the phylum Cnidaria?

Scyphozoa Signup and view all the answers

Which body plans are displayed by cnidarians?

Medusa and polyp Signup and view all the answers

Which group of flatworms is mostly made up of external parasites of fish?

Monogeneans Signup and view all the answers

Which germ layers give rise to surfaces covering tissues, internal tissues, and the lining of the digestive system in flatworms?

Ectoderm, mesoderm, endoderm Signup and view all the answers

Which phylum includes the classes Polychaeta and Clitellata?

Annelida Signup and view all the answers

Why are Echinoderms named as such?

From the Greek words for spiny skin Signup and view all the answers

Which is not a class of Echinoderms?

Gastropoda Signup and view all the answers

How many key features do Chordates share during some stage of their development?

Four Signup and view all the answers

Where are lancelets usually found?

Buried in sand at the bottom of warm temperate and tropical seas Signup and view all the answers

What is the subphylum that includes vertebrates?

Vertebrata Signup and view all the answers

What is the main distinguishing characteristic of all animals in the phylum Arthropoda?

Presence of jointed appendages Signup and view all the answers

Which phylum includes tapeworms, primarily internal parasites of vertebrates?

Platyhelminthes Signup and view all the answers

How many classes make up the phylum Mollusca?

Seven Signup and view all the answers

What is the estimated number of parasitic species within the phylum Nematoda?

16,000 species Signup and view all the answers

Which subphylum of Arthropoda includes insects and their relatives?

Hexapoda Signup and view all the answers

What is the primary habitat where Annelida, or segmented worms, are found?

Marine, terrestrial, and freshwater habitats Signup and view all the answers

What characteristic do tunicates and the organisms mentioned in the text share?

Being suspension feeders Signup and view all the answers

How many species of modern fishes are estimated to exist?

Approximately 31,000 Signup and view all the answers

Which group of vertebrates have both cartilaginous and bony fishes?

Gnathostomes Signup and view all the answers

Which class of vertebrates does the largest number of present-day fishes belong to?

Bony Fishes Signup and view all the answers

What are amphibians known for among vertebrate tetrapods?

The ability to live both in water and on land Signup and view all the answers

What distinguishes members of the clade Osteichthyes?

Having a bony skeleton Signup and view all the answers