Which of the following human activities will have the greatest negative impact on the balance of organisms within an ocean ecosystem? A. mapping of the ocean floor by marine scientists.
B. commercial fishing to provide food for humans
C. recreational boating in rivers, lakes, and streams.
D. monitoring of major global ocean currents

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them