**! need 1. coal, a nonrenewable resource, is the most abundant fossil fuel produced in the united states. although environmental laws and modern technologies have reduced the impact on the environment from the production of coal, coal mining continues to disrupt nearby aquatic ecosystems. high concentrations of toxins and heavy metals can be carried as run-off into nearby ponds and streams. how would this affect the sustainability of the aquatic habitat? a) it could kill off any animals, such as fish, that live exclusively in the pond. b) the heavy metals and toxins will only effect the top predators of the food web. c) because heavy metals and toxins are not lethal to plants, it will not effect the habitat. d) the heavy metals and toxins could affect the food web and reduce biodiversity. 2. there are many positive and negative aspects associated with nuclear power. which is a negative aspect associated with nuclear power? a) nuclear power is a renewable energy source. b) nuclear power does not contribute to the greenhouse effect. c) it is more efficient than other methods of energy production. d) exposure to radiation can lead to disease or genetic abnormalities. 3. most of the wood used for fuel comes from native forests around the world. the harvesting of wood for an energy source has serious environmental implications. identify the environmental concerns of harvesting wood. a) soil erosion b) cost of harvesting c) habitat destruction d) habitat destruction and soil erosion

How does a lytic infection differ from a lysogenic infection?

Experiments in environmental toxicology can sometimes be manipulative experiments in which the researcher actively chooses and manipulates the independent variable. in hunt's study, for example, dosages of bpa were manipulated and the effects were measured. in manipulative studies, the researcher controls all the other variables in the experiment, so any health effects observed in the test subjects can be attributed to differences in the independent variable. in other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. say, for example, that an accidental chemical spill contaminates five ponds. to determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. this would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill. drag type of experiment on the left to the example of experiment on the right. blood concentrations of bpa in college students are compared to their recent manipulative consumption of canned food items 2. the feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams. the deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields 4 tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory. growth of corn plants is compared in field plots sprayed with three different dosage: s of weed killer 7 bpa concentrations in the urine of people with diabetes are compared to bpa concentrations in the urine of people without diabetes - natural; manipulative

Awire-hair terrier and a smooth-hair terrier are mated. the offspring produced are 6 wire-hair puppies and 2 smooth-hair puppies. a. what pattern of inheritance best describes this situation? b. what is the genotype(s) of the wire-haired puppies? of the smooth-haired puppies? c. what would be the expected genotype and phenotype ratios of a mating between 2 wire-haired terriers that are heterozygous?