Organisms can survive at various ph levels. this table shows the minimum ph level at which certain aquatic organisms can survive. the overall effect of acid rain reducing the ph of this aquatic ecosystem to 5.0 is

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

Describe how viruses and bacteria can be used as biological weapons. what are some of the potential threats and potential benefits? do you agree with the use of viruses and bacteria as biological weapons? why or why not?

Which of the following can be assumed about the layers in areas 2 and 4