7. the analysis of water in a lake or stream depends upon more than one field of science or
body of knowledge. suppose you stumble across a portable water-testing lab on a riverbank,
and you find two testing stations: (1) a package of ph (acid/base) test strips and a digital
thermometer; and (2) a light microscope and glass slides. but you find no scientists. match
each testing equipment station to the field of science to which it belongs, and hypothesize
what is being tested in each station. (6 points)

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

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."    

a- all cells come from pre-existing cells

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse