Which of the following is arranged in the proper order from smallest to largest a.) cells, organs, tissues, organ systems b.) organ systems, organs, tissues, cells c.) cells, tissues, organs, organ system d.) tissues, cells, organ systems, organs

Answer C is the correct option!

C) Cells, Tissues, Organs, Organ Systems

Cells are the smallest structures that make up life.

A combination of many cells makes a tissue.

Multiple tissues combine to make an organ.

And lastly, a group of organs combine to form an organ system.

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organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

your answer is "the 1950's"