The local health department is trying to limit the spread of west nile virus in a suburban community. west nile virus is spread by mosquitoes as they feed. in newspapers and on the radio, people in the region are told to drain standing water from any places where mosquitoes might breed. in addition, the health department announces that in a week, they will begin spraying a fog of mosquito poison in the early evening, as soon as the sun sets and mosquitoes become most active. the approach taken by this health department best represents

The answer is Integrated Pest Management. IPM involves integrating practices in an effort to drastically reduce the population of a pest, such as mosquitos, to below the economic injury level (EIL) and reduced risks to human health population. IPM practices should be safe and involve the control the pest rather than eradicate.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg