How does competition affect a community?

Hello! Here is your Competition is an interaction between organisms or species in which both the organisms or species are harmed. Limited supply of at least one resource (such as food, water, and territory) used by both can be a factor. ... Competition is one of many interacting biotic and abiotic factors that affect community structure. Hope this helped! Your fellow user, GalaxyGamingKitty.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.