Suppose a small river with a population of 10000 frogs becomes polluted with cadmium to a level of 3 mg per gallon per day, about how many bullfrogs would be expected to die? a) about 3,000 b) about 7,000 c) about 8,500 d) about 1,500

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously

How water is moving through the ecosystem ?

What does the positioning of transcription factors determine?