Animal Phylogenetic Tree and Hypotheses

How many animal phyla do zoologists currently recognize?

• 25

• 35

• 45

• 55

The significance of bilateral symmetry in animal phylogeny is:

• It allows for the development of a head and tail region, facilitating directional movement.

• It provides a means for animals to have radial symmetry.

• It is a characteristic that only appears in aquatic animals.

• It is unrelated to the evolutionary development of animals.

Which clade do most animal phyla belong to?

• Eumetazoa

• Bilateria

• Deuterostomia

• Ecdysozoa

What is the process called when an animal molts its old exoskeleton and secretes a new one?

• Metamorphosis

• Ecdysis

• Parthenogenesis

• Regeneration

The two characteristic features of animals in the Lophotrochozoa clade are:

• Presence of a lophophore and trochophore larvae

• Bilateral symmetry and radial symmetry

• Exoskeleton and endoskeleton

• Metamorphosis and molting

Match the following

• Cnidarian

• 
• Chordate

• 
• Mollusk

• 
• Echinoderm

• 
• Arthropod

• 

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS4-2

All Deuterostomia are vertebrate T F

• T

• F

All animals except sponges have true tissue T F

• T

• F

All animals share a common ancestor T F

• T

• F

Animals continue to evolve T F

• T

• F