Which of the following is an example of mutualism?
a) a fish protecting a shrimp who builds a burrow for the pair to share
b) a peacock courting and mating with a peahen
c) crayfish and minnows resting under the same rock
d) two snake species with the similar markings advertising their toxic venom

A

Explanation:

The answer is a because mutualism is an interaction between 2 or more species where each species benefits.

A fish protecting a shrimp who builds a burrow for the pair to share

Explanation:

The fish is getting shelter from the shrimp who gets protection from the fish- they are both benefiting from the situation.

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.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg