Select your answer:

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Human Eye and Colourful World › ViewA person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
A. 0.5 D
B. -0.5 D
C. 0.2 D
D. -0.2 D
Entomology › View
What type of organism can be used to determine the status of an ecosystem?
A. alert bug
B. tattle-tale
C. snitch
D. bioindicator