假如人类也是泄殖腔生物,会怎样?
泄殖腔的起源
泄殖腔 /a>(cloaca" alt="泄殖腔孔">p>泄殖孔也即 a href="#" data-lemmaid="559642">泄殖腔 /a>(cloaca
泄殖腔 /a>(cloaca" alt="泄殖腔孔">p>泄殖孔也即 a href="#" data-lemmaid="559642">泄殖腔 /a>(cloaca
泄殖腔 /a>(cloaca" alt="泄殖腔孔">p>泄殖孔也即 a href="#" data-lemmaid="559642">泄殖腔 /a>(cloaca