Among the following, select the correct statements.                                                           

a. In majority of higher plants and animals, growth and reproduction are mutually exclusive events.         

b. In non-living objects growth is by accumulation of material on the surface.         

c. An isolated metabolic reaction outside the body of an organism, performed in a test tube is neither living nor non-living.

d. All organisms, from the prokaryotes to the most complex eukaryotes can sense and respond to environmental cues.