How has human activity added to eutrophication of freshwater lakes?
What will be an ideal response?
The addition of various chemical compounds to the environment can have a variety of effects on the ecosystem. One example is the addition of phosphorus into the environment by runoff from fertilizers used in farming areas. When phosphorus levels increase, algae populations grow exponentially and form algal blooms over the surface. Many lower-level organisms die as a result, and decomposers consume a lot of oxygen. A major consequence of these events is the depletion of oxygen, which ultimately affects fish populations that can't tolerate low levels of the gas.
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Mammals are thought to be living descendants of ____
a. anapsids b. archosaurs c. lepidosaurs d. synapsids e. diapsids
Mutations in the lacI and lacO genes of the lac regulatory system in E. coli often lead to full transcription of the three structural genes, even when no lactose is available to the organism. Such mutations would be called ________
Fill in the blank(s) with correct word
The cardiovascular system consists of the ________ and ________
Fill in the blank(s) with correct word
When carbon dioxide is low in the leaf, the Calvin cycle cannot proceed efficiently and the result is:
A. photorespiration B. shutting down photosynthesis C. cellular respiration D. light-independent reactions