Which of the following may serve as a hydrostatic skeleton?
A) closed circulatory system
B) malpighian tubules
C) gastrovascular cavity
D) water vascular system
Answer: C) gastrovascular cavity
Which of the following may serve as a hydrostatic skeleton?
A) closed circulatory system
B) malpighian tubules
C) gastrovascular cavity
D) water vascular system
Answer: C) gastrovascular cavity