In general, colder temperatures would tend to reduce the fluidity of membranes. in response, cells can adjust the composition of their membranes to maintain the proper degree of fluidity. how would the membrane change in response to colder temperatures?

Many organisms can adapt to colder temperatures by changing the lipids of their membrane.

Explanation:

The cells membrane are a phospholipid bilayer and the fluidity is given by characteristics of the phospholipids. Saturated fatty acids have a rigid structure and in cold temperatures, they solidify (like butter) and the membrane gest rigid. Phospholipids with unsaturated fatty acids have a more flexible structure making the membrane more flexible maintaining the fluidity in colder temperatures (like some oils). An organism that can adapt to temperatures can change the saturated lipids for unsaturated lipids of their membranes maintaining the fluidity of the membrane in cold temperatures.

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.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy