Question

discuss the pros and cons of Szalay and Costello "hidden heat" theory

Answer 1

Disadvantages of this Szalaya theory he says "non_ape promates began walking on two legs but the problem was with the signalling system , because the swollen genital area that were visible when they were down on all four legs.but now the genital area is hidden between the legs so the mating signal was lost".

Advantage is szalaya suggestes ,were females with small swellings but with a little less hair on their rears and little extra fat, it would looked a bit like the time -honored mating signal and they got more attention and produced more offspring.