Stem: support and transport of sap What it is (definition) Stem is a plant organ that is responsible for supporting the tree tops and transporting the elaborate and gross sap produced by the plants from the roots to the leaves. The stem has a cylindrical body and is formed by several layers of various types of tissues.

Entamoeba histolytica: example of amoeboid protozoan What they are - biological definition Also known as Sarcodines, the Amoeboids are protozoa, that is, they belong to the Protist Kingdom. Key features of amoeboids: - Locomotion occurs through pseudopods (from the Greek pseudo meaning false and foot podo).

Atlantic Forest: a biome with rich biodiversity Location, general characteristics and data Atlantic Forest is an important Brazilian biome. It is a tropical forest, distributed in thousands of fragments from the coastal region of Rio Grande do Norte to Rio Grande do Sul. The Atlantic Forest is composed of a large group of forests.

Chameleon: example of a lacertile reptile What they are - biological definition Lacertils are scaled reptiles (order Squamata), which belong to the suborder Sauria. They are mainly found in Asia, Africa and America. There are about 300 known species of lacertils. Summary of main features: - They live mainly in woodland and forest regions.

Coral snake: one of the most venomous in Brazil Summary of the main characteristics of venomous snakes - They have a triangular-shaped flat head; - Have the body covered with rough scales; - usually crawl slowly and straight; - They have two teeth that they use to inoculate the poison (toxin) in the attacking animal; - The tail of these snakes begins thickly, tapering suddenly.

Sclerenchyma: Supporting Plant Tissue (larger image) What are Collenchyma and Sclerenchyma are plant tissues that are primarily responsible for supporting the plants. Main features of the collenchyma - The collenchyma is composed of living cells. - The cells have a thick cell wall consisting of cellulose, pectin and other types of substances.