The water-vascular system is unique to
a. cnidarians.
b. bivalves.
c. echinoderms.
d. annelids.
e. arthropods.
Answer: c
You might also like to view...
Which life history patterns in some rotifers are adapted to living in small bodies of water?
What will be an ideal response?
Research indicates that compared to the genomes of bony fish, the elephant shark genome contains ____ the genes
necessary for bone formation.
a. none of b. half of c. most of d. all but one of e. double
What connects the cytoplasm of adjacent cells in plants?
a. the plasma membrane b. plasmodesmata c. the primary cell wall d. the secondary cell wall
In the scientific method, why is it crucial to start with a question before conducting the empirical analysis?
A. It motivates the specific variation in the treatment required to test the hypothesis. B. Questions are easier to communicate than propositions. C. It facilitates survey responses from subjects. D. It makes writing the results easier.