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Animal

/ˈanəməl/ Noun, pl. animals 1. A living organism belonging to Kingdom Animalia that possess several characteristics that set them apart from other living things, such as: a. being eukaryotic (i.e. the cell contains a membrane-bound nucleus) and usually multicellular (unlike bacteria and most protists, an animal is composed of several cells performing specific functions) ; b. being heterotrophic (unlike plants and algae that are autotrophic, an animal depends on another organism for sustenance) and generally digesting food in an internal chamber (such as a digestive tract); c. lacking cell wall (unlike plants, algae and some fungi that possess cell walls); d. being generally motile, that is being able to move voluntarily; e. embryos passing through a blastula stage; f.  possessing specialized sensory organs for recognizing and responding to stimuli in the environment. (biology-online.org) 2. A living organism that feeds on organic matter, typically having specialized sense organs and nervous system and able to respond rapidly to stimuli. (dictionary.com) Adjective 1. Of or relating to animals (biology-online.com) Word origin: Middle English, from Latin, from animāle, neuter of animālis, living, from anima,...

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Anisogamy

/ˌanīˈsägəmē/ Noun 1. Refers to a form of sexual reproduction involving the union or fusion of two dissimilar gametes (differing either in size alone or in size and form).The smaller gamete is considered to be male (sperm cell), whereas the larger gamete is regarded as female (egg cell). (wikipedia.org) 2. Condition in which gametes which fuse differ in size and/or motility....

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Antebrachium

Noun, pl. antebrachia 1. The forearm. 2. The forearm, i.e. the part of the arm between the elbow and the wrist. (biology-online.org) Word origin: From Latin ante– (before) + brachium (the upper...

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Antenna

/anˈtenə/ Noun, pl. antennae or antennas   1. In biology have historically been paired appendages used for sensing in arthropods. More recently, the term has also been applied to cilium structures present in most cell types of eukaryotes. (wikipedia.org) 2. Either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods. (Google Dictionary) 3. One of the jointed, movable, sensory appendages occurring in pairs on the heads of insects and most other arthropods. (dictionary.com)   Word origin: From Latin antenna, nautical term for yard and common term for pole, of unknown...

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