Sinopsis
MAKE HYPOTHESES
Reptiles are ectotherms—animals with body temperatures influenced by their external environments. Early in the study of dinosaur fossils, many scientists assumed that because dinosaur skeletons resembled those of some modern reptiles, dinosaurs, too, must have been ectotherms. This assumption led scientists to conclude that many dinosaurs, being both huge and ectothermic, were slow-growing, slow-moving, and awkward on land. Because the most complete dinosaur skeletons occurred in rocks formed at the bottom of bodies of water, scientists hypothesized that dinosaurs lived in water and that water helped to support their great weight. When skeletons of duckbilled dinosaurs, called hadrosaurs, were discovered, this hypothesis gained support. Hadrosaurs had broad, flat ducklike bills, which, scientists suggested, helped them collect and eat water plants.
Content
- What is biology?
- Biology: The Study of Life
- Ecology
- Principles of Ecology
- Communities and Biomes
- Population Biology
- Biological Diversity and Conservation
- The Life of a Cell
- The Chemistry of Life
- A View of the Cell
- Cellular Transport and the Cell Cycle
- Energy in a Cell
- Genetics
- Mendel and Meiosis
- DNA and Genes
- Patterns of Heredity and Human Genetics
- Genetic Technology
- Change Through Time
- The History of Life
- The Theory of Evolution
- Primate Evolution
- Organizing Life’s Diversity
- Viruses, Bacteria, Protists, and Fungi
- Viruses and Bacteria
- Protists
- Fungi
- Plants
- What is a plant?
- The Diversity of Plants
- Plant Structure and Function
- Reproduction in Plants
- Invertebrates
- What is an animal?
- Sponges, Cnidarians, Flatworms, and Roundworms
- Mollusks and Segmented Worms
- Arthropods
- Echinoderms and Invertebrate
- Chordates
- Vertebrates
- Fishes and Amphibians
- Reptiles and Birds
- Mammals
- Animal Behavior Chordates
- The Human Body
- Protection, Support, and Locomotion
- The Digestive and Endocrine Systems
- The Nervous System
- Respiration, Circulation, and Excretion
- Reproduction and Development
- Immunity from Disease
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