Biologists in louisiana have become concerned about cadmium levels in the water near new orleans and the probability that frogs
will die out. They performed an experiment on bullfrog tadpoles to determine how toxic cadmium is to bullfrogs. Suppose a small river with a population of 10,000 frogs becomes polluted with cadmium to a level of 3 mg per gallon per day. About how many bullfrogs would be expected to die?
The survival rate of bullfrogs increases as the amount of Cadmium decreases. This will happen because cadmium is a ubiquitous pollutant in aquatic environments. Cadmiun can alter organismal physiology and ecology affecting their growth and development.
phytoplankton falls on the first trophic level which is are "primary producers", it is because even smallest to smallest creatures like zooplankton feed on phytoplankton.
