Animals aremulticellularorganisms.The animal body is composed of several cells performing specific functions as opposed tobacteriaand most protists that are unicellular. The cells may then be organized into various animal tissues, such as epithelial tissues, connective tissues, muscle tissues, nervous ti...
any member of the animal kingdom: organisms that are multicellular and eukaryotic which possess non-photosynthetic, wall-less cells. In some classifications, certain unicellular organisms such as PROTOZOANS are also included. Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunder...
Animal, any of a group of multicellular eukaryotic organisms thought to have evolved independently from the unicellular eukaryotes. Animals differ from other multicellular eukaryotes, the plants and the fungi, in morphology and physiology in that animals
animal, (kingdom Animalia), any of a group of multicellular eukaryotic organisms (i.e., as distinct frombacteria, theirdeoxyribonucleic acid, or DNA, is contained in a membrane-bound nucleus). They are thought to have evolved independently from the unicellular eukaryotes. Animals differ from memb...
Small but dedicated communities are bringing the earliest lineages of the animal kingdom into the lab. Take a look at the ctenophores, the sponges, and the placozoans. What does it mean to be an animal? Looking across the kingdom’s 35 phyla, it’s tempting to think that some are more...
The results of this analysis highlighted four main themes regarding the evolution, retention and duplication of SPIRE in eukaryotes (Fig.1, Supplementary Fig.1). First, SPIRE homologues exist in the majority of Holozoa, including multicellular animals and their closest unicellular relatives, but not...
Any eukaryotic multicellular organism of the biological kingdom Animalia is referred to as an animal. The majority of creatures in this kingdom lack a cell wall, are heterotrophic, motile, have specialized sensory organs, and originate from blastula during embryonic development....
Protists are a diverse group of unicellular or multicellular organisms. Protists have membrane-bound organelles and are placed in the Eukarya domain because they are eukaryotes, which means they have a nucleus. Protists are polyphyletic, meaning they are derived from more than one common evolutionar...
A curious form of scanning phototaxis is present in the multicellular slug stage of the slime mouldDictyostelium discoideum.Dictyosteliumbegins life as a spore, germinating into many independent unicellular amoebae. These cells gather and join together to form a multicellular slug, a slime-covered bag...
Which classification level is broader than the kingdom level? What is the largest phylum of animals? What kingdom are members of the phylum Mollusca a part of? What are animal-like protists called? Which kingdom includes autotrophic and heterotrophic, unicellular and multicellular organisms? What...