14 Questions
Which phylum has the largest number of species?
Nematodes
What is the largest group within the chordates?
Vertebrates
Which family includes humans?
Hominids
What makes chordates especially useful in defining ideas about evolutionary processes?
Their hard parts that survive in the fossil record
What kind of internal body cavity do chordates have?
Fluid-filled
Why is studying chordates of interest to humans?
Because humans belong to this phylum
What distinguishes protostomes from deuterostomes?
Embryological characteristics
Which lineage includes molluscs, annelids, and arthropods?
Ecdysozoa
What term is used for the pattern where dividing cells are aligned during cleavage?
Radial cleavage
What forms the layer between the ectoderm and endoderm in an embryo?
Mesoderm
What is the term for a solid mass of mesodermal cells splitting to form the body cavity within them?
Schizocoelom
Which group includes echinoderms and hemichordates?
Deuterostomes
What is the name for the fluid-filled cavity within the round, hollow ball of cells in an embryo?
Enterocoel
What process involves one wall of the ball of cells indenting and growing inward?
Gastrulation
Explore the origin and diversity of chordates, the fourth largest animal phylum, encompassing cephalochordates, urochordates, and vertebrates. Learn about the evolution and characteristics of these groups within the phylum.
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