A particular plant can have red or white flowers. Assume that flower color is determined by a single gene and that the allele for red flowers (R) is dominant over the allele for white flowers (r). In a cross between a plant with white flowers and a plant with red flowers, have the offspring have red flowers and half have white flowers. Which cross represents the genotypes of the parent generation? A. RR x rr
B. rr x rr
C. RR x RR
D. Rr x rr
E. Rr X Rr
F. RR x Rr

a community that experiences major changes undergoes progress

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."