Sea stars and sea urchins operate their tube feet by
A. cilia transporting hemolymph from chamber to chamber.
B. a water vascular system that regulates water pressure.
C. sticky threads leading from the mouth and primitive brain.
D. actin and myosin fibers that slide and give muscle actions to the five arms or "rays."
Answer: B
You might also like to view...
The cyclic carbon fixation reactions are also known as the
A. Krebs cycle. B. Calvin cycle. C. citric acid cycle. D. tri carboxylic acid cycle.
The invertebrate phylum having the greatest species diversity is Arthropoda
Indicate whether the statement is true or false
The nucleolus is the site where
a. ribosomal RNA is transcribed and ribosomes are assembled. b. DNA replication occurs. c. proteins recently imported from the cytoplasm are deposited. d. translation occurs.
Sexually transmitted chlamydia is similar to infection with Yersinia pestis in that they both can produce
A) urethritis. B) pelvic inflammatory disease in females. C) conjunctivitis. D) buboes. E) pneumonia.