You have reports from four different studies of the effects of a new pesticide on native populations of bees. Each report makes different claims about
whether the pesticide will harm bees and how harming bees can be avoided,
but the studies were done differently. Which of these studies would produce
the most trustworthy results?
O A. A preliminary study conducted for the company that makes the
pesticide.
O B. An investigation whose results have been replicated by several
independent research teams.
O C. A summary of the observations made by the farmers who field-
tested the new pesticide.
OD. A non-replicated experiment conducted by a company that
competes with the pesticide maker.

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."    

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!