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
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If the food source being communicated about is close to the hive, the bee performs the ____
a. round dance, which is image A b. round dance, which is image B c. waggle dance, which is image A d. waggle dance, which is image B e. round dance and the waggle dance in sequence
The first photosynthetic organisms probably
A. lived in the ocean. B. were prokaryotic. C. were cyanobacteria. D. All of these answers are correct.
Bony fish evolved ________ to help keep them afloat.
Fill in the blank(s) with the appropriate word(s).
Which bond can break most easily?
A. Ionic bond B. Covalent bonds C. Polar covalent bond D. Hydrogen bond E. Magnetic bond