Which statement could be a possible explanation for the drop in mercury concentration in the fish of
onondaga lake between the years 2002 and 2003?
(1) between 2000 and 2005, a large number of fish were sampled.
(2) the dumping of industrial waste was prohibited in 2004.
(3) more young fish were tested in 2003, compared to the other years.
(4) the industrial waste contained more mercury in 2004.

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?