Polar gigantism iyo Palaeozoic gigantism ma aha kuwo u dhigma: Nafleyda bahalnimada leh ee ku hoos gabbanaya moolka badda?
Si aad si dhab ah u fahamto farqiga u dhexeeya polar iyo Palaeozoic gigantism, waxaan u baahannahay inaan dhex galno asalkooda.