Which flatworms are free living and are found mostly in marine environments?
a. Turbellaria
b. Trematoda
c. Polychaeta
d. Cestoda
Ans: a. Turbellaria
You might also like to view...
In the disease elephantiasis, lymph vessels become blocked as a result of infection with parasitic worms. Which of the following processes would be impacted by this disease?
A. the return of excess interstitial fluid to the bloodstream B. the diffusion of water and small molecules across the wall of the capillary C. the flow of water back into the capillaries by osmosis D. the generation of pressure to filter materials through the capillary walls E. the exchange of oxygen and other materials between the blood and body cells
Why might unrelated individuals engage in altruistic acts?
A. If they are trying to mate with each other. B. If it is possible they may mate with each other. C. If the altruism is likely to be reciprocated. D. The individuals are part of the same large flock. E. None of these choices are correct.
Vitamin C ____
a. helps blood to clot b. is needed to make collagen c. is used to create coenzymes d. is fat soluble e. protects cell membranes
Some plants are able to endure frequent flooding events because they form
A. adventitious roots that reach above the surface of the water. B. more xylem. C. an extra layer of spongy mesophyll. D. an extra porous epidermal tissue.