Question 3 (1 point) Which of the following describes a biotic factor that would be an advantage to a certain species of freshwater plants in a pond ecosystem?
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Increased rainfall that leads to the habitat of the plants covering more area
Reduction in the population of fish in the pond that eat plants
Toxic waste and trash being dumped into the pond where the plants live
Introduction to the pond of another species of plants that compete for resources
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Question 4 (1 point)
SEP

Asample of digestive juice was removed from the stomach of a pig. the juice was placed in a test tube along with some grains of wheat. a second test tube was set up containing an equal number of wheat grains, with distilled water rather than digestive juice. the test tubes were kept for 8 hours at 40 degrees c. after 8 hours, the grains inside the digestive juice had broken into tiny particles. the grains of wheat, in the water, were wet but otherwise unchanged. what is the control group?