Imagine you found the Lucy A. afarensis skeleton. You have skeletons from a chimpanzee and a modern human in your lab. Which parts of Lucy are similar or different to chimpanzees and modern humans? Which parts of the Lucy skeleton give you the most information to note the similarities and the differences? What conclusions would you reach?

is in the form atp or adenosine triphosphate

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.