Which of the following characteristics could NOT be used to differentiate between the three worm phyla, Annelida, Platyhelminthes, and Nematoda?

a. Segmentation
b. Growth by molting
c. Presence of a complete gut, with two openings
d. Bilateral symmetry
e. The presence of eye spots


Ans: d. Bilateral symmetry

Biology & Microbiology

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The first photosynthetic organisms probably 

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Bony fish evolved ________ to help keep them afloat.

Fill in the blank(s) with the appropriate word(s).

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Which bond can break most easily?

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