The main characteristics of animals are sexual reproduction, eukaryotic cells, movement, multicellularity and heterotrophy. Animal cells are differentiated and organized into tissues, except in sponges. Animal tissues serve specific functions, and they include muscle tissue, nervous tissue, connective tissue and epithelial tissue.
Animal cells are complex and have a membrane, nucleus and organelles, such as ribosomes, Golgi apparatus and mitochondria. They also contain DNA, which is organized into chromosomes. The eukaryotic nature of animals is not unique to them, because other organisms, such as plants, protists and fungi, are also eukaryotic.
Animal cells are also diploid in nature, meaning that they contain two sets of genetic material. Animals are also heterotrophs because they ingest other animals and plants to get the carbon they need for survival. They also depend on oxygen for the production of energy in their cells.
Sexual reproduction in animals entails the combination of male and female genetic material, which results in the creation of new offspring. However, sexual reproduction is not unique to animals because bacteria, fungi and flowering plants also undergo it. There are exceptions in movement because some animals, such as annelids, brachiopods, sponges, hydras and corals, stay in a fixed position for most of their life. The speed of movement also varies among animals. Movement is an important characteristic because it enables animals to capture prey, avoid predators and settle in new habitats.Learn More
Animals living on the tundra have characteristics suited for extreme cold, such as heavy fur coats and small ears. Many also have behavioral adaptations, such as traveling south for winter or huddling together for warmth.Full Answer >
According to Georgia State University, all organisms in the animal kingdom have six common characteristics, including being multicellular, heterotrophic and mobile at some life-cycle stage. They also include sexual reproduction, quick responses to stimuli and the absence of cell walls. Some of these characteristics, for example, sexual reproduction, occur in organisms from other kingdoms, but organisms with all six of these characteristics are animals.Full Answer >
Animals with backbones are called vertebrates, and all vertebrates have a well-developed brain and a living endoskeleton, among other things. An endoskeleton is one that is made from bone or cartilage and grows and survives inside the body, rather than on the outside.Full Answer >
Pigs reproduce via sexual reproduction. Female hogs, known as gilts or sows, reach sexual maturity around five to six months of age and are receptive to pregnancy for two to three days of a 21-day cycle.Full Answer >