Will give brainliest!! For this assignment, you will develop a scientific model on a poster that illustrates the role of
photosynthesis and cellular respiration in the carbon cycle. Your model should also show how carbon
cycles the Earth’s four spheres. Once you have completed your model, you will write a paper with several
paragraphs describing the content of your model in more detail.

The model has carbon in lithosphere, hydrosphere, biosphere, and atmosphere in different forms.

Explanation:

In the model, carbon is present in the atmosphere in the form of carbondioxide gas. This carbon is absorbed by the plants in the process of photosynthesis in order to produce food for itself and other organisms while on the other hand, plants, animals and humans give this carbondioxide to the atmosphere through the process of respiration. Carbon is present in earth spheres such as lithosphere, hydrosphere, biosphere, and atmosphere. Carbon is present in the land in the form of coal, oil, and natural gas, oil shale, and limestone. It is also present in water in dissolve form. It is present in the body of plants and animals in the form of proteins, fats and carbohydrates. It is present in the atmosphere in the form of carbondioxide gas.

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.