For a muscle to contract in a cell, chemical reactions that involve a positive change in the amount of free energy available take place. Which of the following best describes the impact of these reactions in the cell? They cause an increase in total entropy.

They move the cell toward equilibrium.

They occur spontaneously as they give off heat.

They require energy to be absorbed to proceed.

A) They cause an increase in total entropy

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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.