Astudent measured the amount of oxygen and carbon dioxide dissolved in an aquarium containing an aquatic plant and a snail. why did the amount of dissolved oxygen decrease when the aquarium was kept in the dark for 10 hours? a. because photosynthesis could not occur  b. because the plant died  c. because the snail died  d. because cellular respiration could not occur

The us council on environmental quality, the world wildlife fund of the united states, the ecological society of america, the smithsonian institution, and the international union for the conservation of nature have proposed four principles of wildlife conservation. which of the following does not apply to wildlife conservation? a) continuous monitoring, analysis, and assessment b) ecosystem maintenance that includes wildlife c) a plan encompassing entire communities of organisms and all renewable resources d) a continued interest in harvesting populations for sport