Why do vestigial structures not always disappear and still show up in organism? For example humans still have a tail bone, even though we don't have a tail. 1) The organism depends on them to survive

2) The structure is not harmful to the organisms survival

3)Sticks around just incase we need it again

4)The structure makes the organism look cooler

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.