Homologies Both mammals and birds are descendants of ancestral reptiles. Meaning, they both descended from reptiles. Given the list of characteristics below, identify two traits shared between mammals and birds that are homologies and explain your reasons. Reptile Traits three-chambered heart keratinized (waterproof) skin scales ectothermic (cold-blooded) terapod (four-legged) internal fertilization of egg amniotic egg Bird Traits four-chambered heart keratinized (waterproof) skin scales/feathers endothermic (warm-blooded) terapod (four-legged) internal fertilization of egg amniotic egg Mammal Traits four-chambered heart keratinized (waterproof) skin hair endothermic (warm-blooded) terapod (four-legged) internal fertilization of egg amniotic egg

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Evolutionary lineages

An evolutionary lineage is a series of populations of organisms that descend from a common ancestor. Each species in the lineage is the direct consequence of evolutionary change from a common ancestor. A phylogenetic tree is generally used to display lineages visually. Lineages are components of the phylogenetic tree of life. Molecular systematics procedures are widely used to predict lineages.