hip bones vertebrae with arches for support in gravity loss of gill structures in adult Adaptations to new conditions on land: atmospheric oxygen: lungs (gills lost) gravity: supportive vertebrae, walking limbs (fins lost) reproduction still limited to aquatic habitat Animals make behavioral choices under pressure: Predator threat caused animals to seek refuge on land Atmospheric oxygen favored use of lungs gills are expensive to grow;
(favored use of lungs gills; to grow; ) (gills; lost; ) (Predator threat; caused; animals to seek refuge on land Atmospheric oxygen) Context(Predator threat caused,List([317, 339))):(hip bones; vertebrae; ) Context(Predator threat caused,List([317, 339))):(animals; to seek; refuge on land Atmospheric oxygen) (favored use of lungs gills; are; expensive to grow) (fins; lost; reproduction still limited to aquatic habitat Animals) (supportive vertebrae, walking limbs (fins lost) reproduction; limited; to aquatic habitat Animals; T:still)
Predator threat caused,List([317, 339)) Predator threat caused,List([317, 339))
favored use of lungs gills gills Predator threat hip bones animals favored use of lungs gills fins supportive vertebrae, walking limbs (fins lost) reproduction
to grow lost caused vertebrae to seek are lost limited
animals to seek refuge on land Atmospheric oxygen
refuge on land Atmospheric oxygen
expensive to grow
reproduction still limited to aquatic habitat Animals
to aquatic habitat Animals T:still