Evolution (进化) can perform extraordinary makeovers;today's airborne songbirds evolved from the wingless,earthbound dinosaurs that wandered millions of years ago.But some organisms seem to be unchanged—in other words,escape natural selection.The coelacanth,a modern-day fish,is nearly identical to ...
In eukaryotes, many independent evolutionary transitions have been documented between hermaphroditic sexual systems and separate sexes (which is termed dioecy in plants and gonochorism in animals)1. Dioecious plants or gonochoristic animals are characterised by individuals of the same species but with...
Elevation-related differences in novel environment exploration and social dominance in food-caching mountain chickadees Harsh and unpredictable environments have been assumed to favor the evolution of better learning abilities in animals. At the same time, individual variati... D Kozlovsky,C Branch,CA ...
...a crucial period in theevolutionof modern physics. 现代物理学演化过程中的重要时期 柯林斯高阶英语词典 ...the theory ofevolutionby natural selection. 自然选择的进化论 柯林斯高阶英语词典 ...theevolutionof plants and animals. 动植物的进化 ...
We also conducted a phylogenetic analysis of MADS-domain sequences from various species of plants and animals and presented a hypothetical scenario of the evolution of MADS-box genes in plants and animals, taking into account paleontological information. Our study supports the idea that there are ...
It was while in the Galapagos, observing small birds called finches, that Darwin started forming his theory ofevolution. But today, the animals of the Galapagos face the same pressures as animals across the world because of the effe...
Along with the contemporaneous diversification and disparification of numerous other vertebrate clades16,17,18,19,20,21,22, our results help corroborate the fundamental role of the K-Pg mass extinction in shaping the vertebrate biodiversity occupying our planet today. Methods Phylogenetic analyses ...
J. Cain summarized the state of knowledge about the structure of the living world in his major bookAnimal Species and Their Evolution. His work remains remarkably current today. Here Cain explains each of the terms by which scientists now classify all animals--from species through genus, family...
These questions are addressed by the comparison of developmental fates of the blastopore, the opening of the embryonic gut, in diverse animals that live today. Here we review comparative data on the identity and fate of blastoporal tissue, investigate how the formation of the through-gut ...
We review some recently published results on sex chromosomes in a diversity of species. We focus on several fish and some plants whose sex chromosomes appear to be ‘young’, as only parts of the chromosome are nonrecombining, while the rest is pseudoaut