Which is an example of an organism?
a. a snake's heart
b. a beehive
c. a hickory tree
d. the stripes on a tiger

 The best answer is c - a hickory tree.

An organism  is defined as a living thing which can function  on its own. It has interdependent parts and is capable to some degree of responding to stimuli, can reproduce, grow and develop and maintain homeostasis. Plants are organisms because they fulfill all these characteristics.

On organism is made up of one or more cells. If it has only one cell it is called a unicellular organism and if it has more than one cell it called a multi cellular organism.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).