Question

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Answer 1

Answer:

1)BILATERAL SYMMETRY:-only one imaginary axis passing through the body dividies it into two equal halves. For eg: Human

2)BODY CAVITY:-cavity between the body and internal organs is called as body cavity /coelom. For eg: Ventral body cavity

3)TRIPLOBLASTIC:- three germinal layers, ectoderm, mesoderm and endoderm present. For eg: Molluscs

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Answer 2

Answer:

a) a basic body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline.

b) the body cavity of higher metazoans, between the body wall and intestine, lined with a mesodermal epithelium.

c) having three primary germ layers, as the embryos of vertebrates.

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