2. Which of the following autotrophs is also a producer? (a) a maple tree
(b) the blue-green bacteria known as cyanobacteria
(c) Laurencia, a marine genus of Red Algae from Hawaii.
(d) All of the above are producers.

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