You are "living off the grid" meaning that you are not using any public utilities: no water supply, sewer connection, natural gas, or electricity. You do have a septic tank, whose pipe carries sewage underground where it is released over a wide area, the leaching field. There is also a small pond out there that you have stocked with fish. However, you notice that the fish are floating dead in the water, and the pond has a green scum on it. What happened?
A. There are not enough nutrients in the water, so the fish died.
B. Chemical toxins from your septic tank cleaner have killed the fish.
C. There is oxygen depletion in the pond due to the leakage of phosphates and other compounds from your septic tank.
D. The fish died due to a lack of calcium, which then caused the algae to overgrow.
Answer: C
You might also like to view...
How does a phage transfer DNA from one bacterium to another?
a. Phages form a bridge between bacterial cells that allows DNA to pass from the host cell to the recipient cell. b. Phages form a bridge between bacterial cells that allows DNA to pass in both directions between the two cells. c. Phages lyse bacterial cells, releasing bacterial DNA into the environment, which is taken up by other phages for transfer to new cells. d. When phages assemble in an infected bacterial cell, they may incorporate host DNA; released phages may attach to other cells and inject the bacterial DNA into those cells. e. Phages attach to receptors on bacterial cells and receive some of the target cells’ DNA; the phages release this DNA into the environment to be taken up by other bacterial cells.
The pulmonary capillaries
a. are closely associated with alveoli but do not fuse. b. fuse with the alveoli to facilitate gas exchange. c. bring oxygenated blood back to the heart. d. bring deoxygenated blood back to the heart. e. fuse with the alveoli to facilitate gas exchange, and bring oxygenated blood back to the heart.
Four of the five answers listed below are parts of the same anatomical area. Select the exception
a. humerus b. fibula c. radius d. clavicle e. scapula
Variations of homologous genes that result in differences in structure and function are
A) alleles. B) loci. C) autosomes. D) dominant. E) linked.