New technologies could improve conditions for all societies. However, priorities are different in different parts of the world. Which is the most
important goal of technology in societies in the United States and Europe?
O A. Developing new sources of clean drinking water
O B. Designing artificial habitats for use in space exploration
O C. Producing more food for a growing population
O D. Treating the diseases of an aging population

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.

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explanation:

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