Imagine you’re an ecologist and need to estimate the total number of a specie like a spider that’s inhabiting a 500 square meter of a rainforest. can someone explain the procedure to follow to get an estimate, can it include the hypothetical data? ! plz and (ecology)

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half