Step One: Anatomical Developments Match the following anatomical developments (A-J) with the number where they occur on the Hominin Anatomy Phylogeny (below).

A. decreased prognathism, moderate sized molars, phalanges not curved (derived), Found in South Africa, still relatively small brain (~450cc)

B. canine reduction, lower jaw tooth row shape intermediate between parallel and parabolic, have footprints explicitly displaying bipedal patterns, curved phalanges

C. further brain expansion, decrease in teeth size, decrease in brow ridges, flattening of the face, mental eminence, vertical forehead

D. megadontia complex (huge molars, jaws, and chewing muscles), slight increase in cranial capacity (410-530cc)

E. femur and pelvis indicate capable of bipedalism

F. brain expansion, megadontia reduction, smaller less projecting face, smaller jaws

G. occipital bun common, retromolar space, robust postcrania, relatively short limbs

H. further brain expansion, reduction in teeth, face, and jaws, increased brow ridges, increased body size

I. loss of honing complex, obligate bipedalism, curved phalanges (primitive), parallel tooth row shape

J. foramen magnum position indicates likely capable of bipedalism

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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."    

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.