Question

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Answer 1

Answer:

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• PLATYHELMINTHES
• PHARYNX

Features:

The body of animals in this group is far more

complexly designed than in the two other

groups we have considered so far. The body

is bilaterally symmetrical, meaning that the

left and the right halves of the body have the

same design. There are three layers of cells

from which differentiated tissues can be

made, which is why such animals are called

triploblastic. This allows outside and inside

body linings as well as some organs to be

made. There is thus some degree of tissue

formation. However, there is no true internal

body cavity or coelom, in which well developed organs can be accommodated. The

body is flattened dorsoventrally (meaning from

top to bottom), which is why these animals are

called flatworms. They are either free-living or

parasitic. Some examples are free-living

animals like planarians, or parasitic animals

like liverflukes