This article focuses on the segmentation of animal body plans, specifically using the examples of the taxa Arthropoda, Chordata, and Annelida.These three groups form segments by using a "growth zone" to direct and define the segments. Eukaryotic Cell Definition. Biologically speaking, an organism that is sessile (as opposed to motile) lacks the ability of self-locomotion and is predominantly immobile.. An animal (plural: animals) refers to any of the eukaryotic multicellular organisms of the biological kingdom Animalia generally characterized to be heterotrophic, motile, having specialized sensory organs, lacking cell wall, and growing from a blastula during embryonic development. In zoology, sessility applies to those animals which are attached to a substrate.Most often these are marine animals, such as mussels, although parasites such as the cochineal insect assume a fixed life cycle upon their plant hosts. Segmentation in biology is the division of some animal and plant body plans into a series of repetitive segments. Etymology: Latin animale (neuter of animalis). They are eukaryotic cells. Biology is often approached on the basis of levels that deal with fundamental units of life.
Animal cell definition. Learn more about types of animal behaviors and how behavior is shaped by genes and environment. Choose from 500 different sets of animal biology flashcards on Quizlet. Viruses possess unique infective properties and thus often cause disease in host organisms. Fitness. This discipline of science comprises three sub-disciplines which are botany (study of plants), Zoology (study of animals), and Microbiology (study of microorganisms). It is a double-membraned organelle containing nuclear structures, e.g. Organisms are adapted to their environments in a variety of ways, such as in their structure, physiology, and genetics. Animal, any of a group of multicellular eukaryotic organisms thought to have evolved independently from the unicellular eukaryotes. The other methods that are employed for getting rid of intracellular debris includes endocytosis, wherein there are protein receptors involved which are recycled from the cell surface and autophagy, wherein old, worn out organelles reach the lysosome for destruction. Digestion, sequence by which food is broken down and chemically converted so that it can be absorbed by the cells of an organism and used to maintain vital bodily functions. Behavior is a crucial way that animals interact with each other and with their environment. physically or mentally, as in physical.. Animal definition. In eukaryotic cell, the nucleus is the organelle responsible for maintaining the integrity of DNA and for controlling cellular activities such as metabolism, growth, and reproduction by regulating gene expression. Adaptation, in biology, the process by which a species becomes fitted to its environment; it is the result of natural selection’s acting upon heritable variation over several generations.