Low concentrations of insecticide do not affect leopard frogs, but are lethal to zooplankton. Reduced zooplankton allows phytoplankton to increase, shading out periphyton (the vegetative food source for frog tadpoles), so tadpole growth is limited. Would a decrease in leopard frog population size following addition of the insecticide be due to top- down or bottom up control?

Top-down
Bottom-up

Astudent conducts an experiment to see how music affects plant growth. the student obtains four identical plants. each one is potted in the same type of soil and receives the same amount of sunlight and water each day. plant a listens to classical music for three hours each day. plant b listens to rock music for three hours each day. plant c listens to country music for three hours each day. plant d does not listen to any music at all. 2. based on the experiment in the scenario, which visual aid would be most in showing the change in the plants' heights over time? a. a pie chart b. a line graph c. a timeline d. a bar graph

Find a formal factor that connects egypt to africa to europe and to southwest asia

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j