The tool most effective at monitoring the anaerobic conditions caused by sudden spikes in the population of algae in a lake is the A) rain gauge. B) Secchi disc. C) thermometer. D) dissolved oxygen meter.

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a.cornb.ironc.cottonseedd. vitamin a