Human impact on the environment or anthropogenic impact on the environment includes impacts on biophysical environments, biodiversity, and other resources. The term anthropogenic designates an effect or object resulting from human activity.
Animals can be divided broadly into vertebrates and invertebrates. Vertebrates have a backbone or spine (vertebral column), and amount to less than five percent of all described animal species. They include fish, amphibians, reptiles, birds and mammals. The remaining animals are the invertebrates, which lack a backbone. These include molluscs (clams, oysters, octopuses, squid, snails); arthropods (millipedes, centipedes, insects, spiders, scorpions, crabs, lobsters, shrimp); annelids (earthworms, leeches), cnidarians (jellyfish, sea anemones, corals), and sponges.
A supporting framework in an animal that is contained inside the body. Humans and many other vertebrate animals have bony endoskeletons. Certain invertebrate animals, such as sponges, have endoskeletons made up of needle-like structures called spicules. Compare exoskeleton.ndoskeleton. n. 1. (Zoology) the internal skeleton of an animal, esp the bony or cartilaginous skeleton of vertebrates. Compare exoskeleton.