Invasive Grey squirrels are outcompeting red squirrels in Britain because...
A) they spread disease to red squirrels B) they are more efficient at exploiting acorns. C) they pilfer red squirrels acorn caches. D) there is extensive habitat loss. E) they physically intimidate red squirrels.
Parasites of one species of fly which makes galls on the seaside plant sea-oxeye daisy, can spill over and reduce the densities of galls on a neighboring plant, Jesuit's bark. This is an example of:
A) apparent competition B) competition C) associational susceptibility D) mutualism E) commensalism