Contrast the various functions of the mantle between Cephalopods and Gastropods
What will be an ideal response?
The mantle is responsible for secreting calcium carbonate into the production of the shell of molluscs. In the cephalopods, the mantle cavity is contracted forcefully to generate a jet of water, providing forward propulsion. In other molluscs, such as some snails, the mantle is used for gas exchange.
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Most of the oxygen in the blood is transported by
a. plasma. b. megakaryocytes. c. platelets. d. hemoglobin. e. leukocytes.
Respiratory distress syndrome is due to
a. a lack of surfactant in the lungs. b. premature birth. c. lack of prenatal care. d. a lack of surfactant in the lungs and premature birth. e. premature birth and lack of prenatal care.
During a routine, a dancer spins in a circle three consecutive times. This is an example of ___
a. circumduction b. rotation c. pronation d. supination e. hyperextension
Commercial micropropagation methods result in cloning of plants.
a. true b. false