Sea cucumbers belong to the class:
a. Asteroidea.
b. Ophiuroidea.
c. Echinoidea.
d. Holothuroidea.
e. Crinoidea.
D
You might also like to view...
Which of the following statements about photorespiration is INCORRECT?
A. Photorespiration tends to occur under dry and hot conditions. B. It utilizes oxygen to produce a 3-carbon sugar precursor. C. It liberates CO2. D. It occurs in C3 plants. E. It utilizes the enzyme PEP carboxylase rather than Rubisco to produce 3-phosphoglycerate.
When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. denitrification B. nitrogen fixation C. anammox reaction D. All of the choices are correct.
Jean Baptiste Lamarck developed a hypothesis that has been referred to as "inheritance of acquired characteristics." In it he proposed that
a. giraffes were created with long necks. b. giraffes with slightly longer necks would be better able to reproduce. c. changes in structure size in an individual can be inherited. d. all members of a species must change identically. e. giraffes developed longer necks to compensate for shorter legs.
Antibiotics can be effective only against a
A) bacterium. B) virus. C) prion. D) viroid.