The major source of imbalance in the carbon cycle is the result of a) human activities. b) changes in earth's orbit. c) increased volcanic activity. d) changes in weather patterns.

allowed for the prediction of the properties of missing elements.

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive