Which of the following practices is common for organic crop production according to the us department of agriculture? a) using hydrogen peroxide as a fertilizer b) using chemicals known as pheromones to disrupt insect mating cycles c) using genetically modified plant variety that kill insects d) using sewage sludge to improve the fertility and structure of the soil e) using arsenic to remove unwanted insects

The correct answer would be B) using chemicals known as pheromones to disrupt insect mating cycles.

Organic farming is a type of agriculture in which natural methods are practiced. Chemicals such as pesticides, fertilizers, growth hormones, antibiotics, genetically modified organisms are prohibited in organic farming.

Pheromones are natural chemicals or substances released by animals. These are used in pheromone traps to lure insects. It helps in controlling insect breeding and thus, helps in insect control naturally without the aid of pesticides or insecticides.

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."    

multiplying and dividing the two decimals and the eqations by the same number of the overalls