Which Two Characteristics Do All Animals Have?
10.1: Animal Characteristics
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Is an insect an animal?
Of class it is. Is a snail an insect? No, snails are mollusks. Discover the large "foot" that allows move, and the antennas are obvious. Actually, a snail'south eyes are on the ii long projections on its caput, and the projections are called eyestalks. These are characteristics of this animal.
Characteristics of Animals
Animals are a kingdom of multicellular eukaryotes. They cannot brand their own nutrient. Instead, they get nutrients by eating other living things. Therefore, animals are heterotrophs.
Animal Cells
Like the cells of all eukaryotes, brute cells have a nucleus and other membrane-bound organelles (see Figure below). Unlike the cells of plants and fungi, animal cells lack a jail cell wall. This gives animal cells flexibility. It lets them take on unlike shapes and then they tin can become specialized to exercise particular jobs. The human nerve prison cell shown in Figure beneath is a skilful example. Its shape suits its part of transmitting nerve impulses over long distances. A nerve cell would exist unable to accept this shape if it were surrounded by a rigid cell wall.
Beast Cell. The shape of an animate being cell is non constrained past a rigid cell wall. A bacterial cell is shown above for comparison.
Human being Nerve Jail cell. A human nervus cell is specialized to transmit nerve impulses. How do y'all think the cell'due south shape helps it perform this function?
Animal Structure and Function
Animals not only have specialized cells. Well-nigh animals also have tissues and organs. In many animals, organs form organ systems, such as a nervous arrangement. Higher levels of organization allow animals to perform many complex functions. What can animals do that nearly other living things cannot? Most animals share these characteristics: sensory organs, movement, and internal digestion. All of them are illustrated in Figure below.
- Animals can detect environmental stimuli, such as lite, sound, and bear on. Stimuli are detected past sensory nerve cells. The data is transmitted and processed by the nervous organisation. The nervous system, in turn, may directly the body to reply.
- All animals can motion, at to the lowest degree during some stage of their life cycle. Muscles and fretfulness work together to permit movement. Being able to motility lets animals actively search for food and mates. It also helps them escape from predators.
- Almost all animals have internal digestion of food. Animals eat other organisms and may use special tissues and organs to assimilate them. (Many other organisms blot nutrients directly from the surroundings.)
Well-nigh animals share these characteristics: sensory organs, movement, and internal digestion.
Animal Life Cycle and Reproduction
Many animals have a relatively simple life cycle. A general animal life cycle is shown in Figure below. Nearly animals spend the majority of their life as diploid organisms. Only about all animals reproduce sexually. Diploid adults undergo meiosis to produce sperm or eggs.Fertilization occurs when a sperm and an egg fuse. The zygote that forms develops into an embryo. The embryo eventually develops into an adult.
Animate being Life Cycle. An animal life cycle that includes only sexual reproduction is shown here. Some animals also reproduce asexually. How does the beast life wheel compare with the life cycle of a plant?
Summary
- Animals are multicellular eukaryotes that lack cell walls.
- All animals are heterotrophs.
- Animals take sensory organs, the power to motion, and internal digestion. They too have sexual reproduction.
Review
- Identify traits that characterize all animals.
- State one way that animal cells differ from the cells of plants and fungi. What is the significance of this difference?
- Depict animal digestion.
- Depict a general animate being life cycle.
Source: https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_Introductory_Biology_(CK-12)/10%3A_Animals/10.01%3A_Animal_Characteristics
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