If flatworms lacked protonephridia:A
they would not be able to reproduce.
B. they would not be considered to be hermaphrodites.
C. they would have difficulty with orientation.
D. they would have difficulty with fluid balance.
E. they would have difficulty sensing prey.
D
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What is clonal selection? How does it occur?
What will be an ideal response?
Stem cells ____
a. have the property of self-renewal by division b. are the least likely to give rise to cancer c. do not have the ability to divide d. are immature cells that become nerve tissue susceptible to cancer e. are found only in cancerous tumors
Which protist group includes members with plantlike traits such as chloroplasts and multicellularity?
A) Slime molds B) Algae C) Amoebas D) None of the protists have chloroplasts.
The most important ion in controlling the movement of water into and out of the guard cells is
A. carbon. B. hydrogen. C. potassium. D. nitrogen. E. sodium.