Maria wanted to learn more about the birds that visit her backyard. She installed several bird feeders and offered the same variety of bird seed mixes in each feeder in order to attract a mix of bird species. For a month, she observed the bird feeders three times a day for an hour each day and counted the types of birds that visited the feeders. Then, she made a pie chart to compare the numbers of birds of each species that visited the feeders.

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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 answer is c. it will give up it's valence electron to the other atom.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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