Which statement best describes extracellular digestion?
a. Extracellular digestion is seen in sponges.
b. Extracellular digestion occurs in most animals.
c. Extracellular digestion must involve choanocytes.
d. Extracellular digestion may take place in a tube contained inside the body.
Ans: d. Extracellular digestion may take place in a tube contained inside the body.
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How do the features of a larval tunicate differ from an adult tunicate? Check all that apply.
_____ Larval tunicates have a conspicuous notochord that is lost by the time they reach adulthood. _____ Larval tunicates have a hollow dorsal nerve cord that is reduced to a ganglion in adults. _____ The tail of a larval tunicate is lost by the time it transforms into an adult. _____ The pharynx of the larval tunicate becomes more prominent in the adult. _____ The larval tunicate lacks an incurrent and siphon but the adult has both structures.
Which of these waves has the longest wavelength?
a. blue visible light b. gamma rays c. UV rays d. x-rays e. red visible light
In a hydrothermal vent community pictured here, the typical consumer is a(n) ____
a. coral reef b. bacteria c. archaea d. tube worm e. algae
The __________ can be considered a sorting, processing and packaging center
a. centriole b. centrosome c. Golgi complex d. vacuole e. cytoskeleton