The grid-table indicates the level of impact that each of the 5 drivers of biome and ecosystem degradation have had over the last
century. The arrows indicate the current trend of each driver on the particular ecosystems. According to this grid-table, which driver
currently seems to be the most under control and what have humans done to help control the impact it has on the Earth's
ecosystems?
Invasive Species; Restrictions have been set at the borders to control the
the amount of non-native animals and plants that are introduced to stable
ecosystems.
Over-exploitation; Laws are in place to aid in the conservation of the
natural resources which include the licensing of wild game hunting and
fishing along with the creation of national parks to protect vital
ecosystems
Climate change; Advancement in hybrid and electrical automobile
manufacturing along with the increase use of clean nuclear energy. Both
reduce the amount of green-house gases that are being released into the
Surrounding environment
Pollution (nitrogen and phosphorus); Techniques are being used to reduce
the amount of run-off that occurs in agriculture during the growing and
non-growing seasons. This run-off can contain excessive amount of
nitrogen from the fertilizers used on the crops.

ANSWER :B

Why do mutations in genes affect traits? o a. genes determine what type of mutagens an organism has. o b. genes produce proteins that cause traits. o c. genes affect how many chromosomes an organism has o d. genes code for carbohydrates that influence traits.

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

What maintain homeostasis when a persons internal body temperature is 97.5°f