Hermit crabs have a soft belly and live in the ocean. to protect themselves, they crawl into discarded snail shells and use them for homes. which symbiotic relationship describes the association of hermit crabs and snails?

a. commensalism

b. mutualism

c. parasitism

d. competition

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

In this assignment, you will analyze an example of speciation by researching the finches of the galapagos islands. then you will answer questions to construct explanations and draw conclusions based on the information you gather. someone plz !

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.