Weather is a complex system. Which of these is a way that meteorologists use a range of numbers to study weather patterns?
A. by studying examples of the weather on same day in previous years
B. by recording the temperature at noon each day
c. by recording temperatures through the day and taking an average
D. by recording the high and low temperature for each day
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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.