Origin of Chordates: Overview

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Which phylum has the largest number of species?

Nematodes (correct)

Arthropods

Molluscs

Chordates

What is the largest group within the chordates?

Urochordates

Cephalochordates

Vertebrates (correct)

Hominids

Which family includes humans?

Cephalochordates

Arthropods

Urochordates

Hominids (correct)

What makes chordates especially useful in defining ideas about evolutionary processes?

Their hard parts that survive in the fossil record Signup and view all the answers

What kind of internal body cavity do chordates have?

Fluid-filled Signup and view all the answers

Why is studying chordates of interest to humans?

Because humans belong to this phylum Signup and view all the answers

What distinguishes protostomes from deuterostomes?

Embryological characteristics Signup and view all the answers

Which lineage includes molluscs, annelids, and arthropods?

Ecdysozoa Signup and view all the answers

What term is used for the pattern where dividing cells are aligned during cleavage?

Radial cleavage Signup and view all the answers

What forms the layer between the ectoderm and endoderm in an embryo?

Mesoderm Signup and view all the answers

What is the term for a solid mass of mesodermal cells splitting to form the body cavity within them?

Schizocoelom Signup and view all the answers

Which group includes echinoderms and hemichordates?

Deuterostomes Signup and view all the answers

What is the name for the fluid-filled cavity within the round, hollow ball of cells in an embryo?

Enterocoel Signup and view all the answers

What process involves one wall of the ball of cells indenting and growing inward?

Gastrulation Signup and view all the answers

Origin of Chordates: Overview

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