Question: Crinoids (feather Stars) Can Be Infested With Other Animals Such As Some Gastropods Or Arthropods. In An Analysis Of A Large Population Of Crinoids And Their Infestors, It Was Observed That Infested Crinoids Were Smaller On Average Than Uninfested Crinoids. Based On This Observation, What Would Be The Best Way To Describe The Relationship Between Crinoids …

Crinoids (feather stars) can be infested with other animals such as some gastropods or arthropods. In an analysis of a large population of crinoids and their infestors, it was observed that infested crinoids were smaller on average than uninfested crinoids. Based on this observation, what would be the best way to describe the relationship between crinoids and infestors? Select one: O a. Mutualism O b. Symbiosis. O c. Commensalism. O d. Parasitism. There is enormous diversity within the Phylum Arthropoda, and yet some characteristics are still shared by all arthropods. Which of the characteristics below is found in every arthropod on Earth? Select one: O a. Jointed biramous limbs. O b. A tagma called a head. c. Metamorphosis. O d. A cuticle containing chitin. O e. Compound eyes. What body form characteristic differentiates the subphylum Plematozoa from the subphylum Eleutherozoa? Select one: O a. Plematozoans are elongated along the oral-aboral axis. O b. Both the mouth and the anus are on the oral surface. O c. Plematozoans can walk along the ocean floor. O d. Plematozoans are typically round and have no arms.