You are presented with an animal that resembles a jellyfish. As you examine it further, which characteristic would allow you to conclude that it belongs to the Phylum Ctenophora rather than the Phylum Cnidaria?
A. complete digestive tract.
B. tentacles.
C. gonads.
D. stinging cells.
A. complete digestive tract.
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Which organ or structure aids in digestion but is not part of the human alimentary canal?
A. esophagus B. mouth C. liver D. stomach E. small intestine
Fill in the blanks to complete the following statements. ? ?A disease that is not active and remains dormant until conditions are favorable for it to reproduce again is going through a period of ________
Fill in the blank(s) with correct word
The diffusion of water molecules across a selectively permeable membrane is called
A) facilitated diffusion. B) exocytosis. C) active transport. D) osmosis. E) hydrolysis.
The Dlx gene encodes a transcription factor that signals clusters of embryonic cells to ____ and gives rise to an appendage.
A. fold into the cardiac muscle B. protrude from the body C. form reproductive structures D. induce apoptosis in cells lining the appendages E. develop into the immune system