Sinopsis
One of the first things biologists look for when they are searching for characteristics of life is structure, or organization. Whether an organism is made of a single cell or billions of cells, all of its parts work together in an orderly living system. Another important characteristic of life is reproduction. Reproduction is the ability of an organism to make more of the same type of organism. The new organisms that are made are called offspring. Although reproduction is not needed for the survival of an individual organism, it must occur for the continuation of the organism’s species. A species (SPEE sheez) consists of a group of organisms that can mate with each other and produce offspring that are able to reproduce. For example, there are many species of crocodiles including the American crocodile, the Australian freshwater crocodile, and the saltwater crocodile. American crocodiles reproduce only American crocodiles. Without reproduction, the species would die out. Another characteristic of life is that growth and development must take place. An organism begins life as a single cell. As time passes, it grows and develops. As growth and development take place, the organism takes on the characteristics of its species. Growth results in the formation of new structures and an increase in the amount of living material. Development refers to the changes that occur in each organism’s life.
Content
- Biology: The Study of Life
- Principles of Ecology
- Communities and Biomes
- Population Biology
- Biological Diversity and Conservation
- The Chemistry of Life
- A View of the Cell
- Cellular Transport and the Cell Cycle
- Energy in a Cell
- Mendel and Meiosis
- DNA and Genes
- Patterns of Heredity and Human Genetics
- Genetic Technology
- The History of Life
- The Theory of Evolution
- Primate Evolution
- Organizing Life’s Diversity
- Viruses and Bacteria
- Protists
- Fungi
- What is a plant?
- The Diversity of Plants
- Plant Structure and Function
- Reproduction in Plants
- What is an animal?
- Sponges, Cnidarians, Flatworms, and Roundworms
- Mollusks and Segmented Worms
- Arthropods
- Echinoderms and Invertebrate Chordates
- Fishes and Amphibians
- Reptiles and Birds
- Mammals
- Animal Behavior
- 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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