Explanation:
Animal indicator list is a barometer to check how a particular ecosystem is affecting the lives of particular animals. The indicator measures stress or behavior in the ecosystem to know whether to protect the specie or allow them undisturbed
This is to avoid or reduce to barest minimum incidences of extinction of such specie in the ecosystem.
The grizzly sudden reduction in number from well over 100,000 in California to less than nothing in 1942 triggered the need to protect the grizzlies from human destruction and possible extinction. Grizzlies was a national specie and appeared in the flag of California. The population gradually reduced in most of the states of Idaho, Utah, Alaska and many more.
The grizzlies in 1975 were declared protected species to avoid being hunted or trapped by humans and to repopulate them in the areas where they once lived. Their future will depend largely on humans ability to allow them to coexist with them, by setting out a large area for them to live and regroup.
This will go to balance the ecosystem which has been tampered or disturbed by development.
-cantidad de muertes anuales (causas naturales)
-cantidad de muertes anuales (causas no naturales)
-cantidad de inmigrantes anuales
-cantidad de emigrantes anuales
Answer:
B. Rock and soil that is removed to mine ore.
Explanation:
Overburden is a material or substances that is present above the metal ore. This metal ore is present inside the rock and soil so for its extraction the rock and soil must be removed that is present above it. Metal ore such as gold, silver,coal, iron and platinum are present inside the earth crust. These metals are not present in pure form some soil particles or other substances are present with it which is removed with the help of various instruments and machines.