What types of organisms were the very first living things on earth.
a) multicellular organisms
b) the first living things on earth were not made of cells
c) unicellular organisms
d) both multicellular and unicellular organisms

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