What can cause a gap in the rock record a) lack of rock deposition. b) erosion. c) neither erosion nor lack of deposition. d) both erosion and lack of rock deposition

b. the carbon cycle ensures living things have a source of hydrogen

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