, and reptiles into birds and mammals, with humans finally arriving on the scene a couple hundred thousand years ago (the actual date is debated). without assessing the truth of this worldview, we can identify four basic implications of it. if naturalism is true: there is no objective meaning to our...
and more like their analogs in other vertebrate classes. hair and other α-keratins consist of α-helically-coiled single protein strands (with regular intra-chain h-bonding ), which are then further wound together into superhelical or coiled-coil ropes that may be further coiled. the β-keratins of reptiles...
students will learn the difference between amphibians and reptiles, the concept of warm-blooded vs. cold-blooded, what metamorphosis is, and how these animals adapt. unit : how animals work lesson of lesson : insects students will learn about insects and how certain adaptations help them cope with their...