A Adaptations. Adaptations let living things to inhabit different environments. These may consist of structural modifications, changes in physiological processes or even variation in behavioural patterns. Air. Gas mixture laying in the troposphere, mainly consisting of nitrogen and oxygen . Algae. Group of unicellular or pluricellular protoctist whose cells do not form tissues. They perform photosynthesis. Angiosperms. Group of plants with flowers, vascular tissues and seeds inside fruits. For example, the apple tree or the poppy. From the Greek angeion: receptacle and sperma: seed . Annelid. Group of invertebrate with an elongated and soft body, divided in segments or rings. For example, the earthworm. From the latin annellus: little ring. Anther. Part of the stamen which contains the pollen grains. Anura. Group of amphibians, with no tail . Their back legs are long and adapted for jumping. They are the frogs and toads. From the Greek an: without and oura: tail . Aquifer. Underground water reser ves. Arthropods. Group of invertebrate covered by an exoskeleton with a segmented body and articulated appendages. For example, the beetle or ant. From the Greek arthron: articulated and podo: foot. Articulated appendix. Paired structures presented in arthropods made by articulated elements like the legs, the wings or the antennas. Asteroid. Small , metallic and rocky body in space with a irregular shape. Atmosphere. Layer of gases that surround a planet. The Earth atmosphere is formed by air. From the Greek atmós: steam and sphâira: sphere. Atrium. Sponge or poriferous internal cavity. Autotrophic. Organism that produces organic substances by itself, using an energy source like solar light, and inorganic substances like water and mineral salts. From the Greek auto: by itself and trophós: to eat. 24
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