Organs are composed of tissues, which are composed of cells. This is an example of which characteristic of life? A. Living things grow and develop
B. Living things respond to stimuli
C. Living things maintain themselves by homeostasis
D. Living things have levels of organization
E. Living things are adapted to their environment

Influenza (the flu) is caused by a virus that attacks the respiratory system. which type of gene is most likely to be widely expressed in the body of someone who contracts the influenza virus? a the gene that controls the production of stem cells b the gene that controls the production of skin cells c the gene that controls the production of red blood cells d the gene that controls the production of white blood cells