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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 process by which natural forces move weathered rock and soil brim one place to another is called

You decide that the introduction should also discuss the extremophiles that are referred to as the archaea. these single-cell organisms are considered "extremophiles" due to their ability to survive and reproduce in environmental conditions that would be hostile for most living organisms. archaea species have been isolated from highly acidic sulfur springs, ocean floor thermal vents with temperatures that exceed boiling, and subarctic ice well below freezing. while still considered to be prokaryotic, the archaea have numerous differences that place them apart from the bacteria. choose the characteristics that separate the archaea from other prokaryotic cells. select all that apply. view available hint(s) select all that apply. archaea lack true peptidoglycan in their cell walls. the morphology of the cell is rigid and is geometric in shape, similar to a sphere or cylinder. the cytoplasmic membrane lipids of archaea have branched or ringform hydrocarbon chains. all currently identified and characterized archaea have been linked as the causative agent to an animal or human disease.

How does natural selection change thephenotypes within a population over time?