Suppose scientists noticed that several tundra plant species were declining in number. At the same time, they noticed that certain plant-eating insect species increased greatly in number, but two species of migratory birds that eat mice, spiders, and other small animals were declining. What one factor might account for all of these observations? Arctic mice were eating more plants.

Wolf spiders had almost completely disappeared.

Temperature changes were affecting the birds’ feeding patterns.

Some sort of disease was spreading across the tundra.

it will increase due to the time span

amber has allowed scientists to study dna that has been preserved over millions of years.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.