Supplementary Angles are pairs of angles such that their sum is 180°. Each of these has a theorem that can be used to prove that the two lines are parallel. Theorems on Proving Parallel Lines: Corresponding Angles Theorem. If two parallel lines are cut by a transversal, then the corresponding angles are congruent.

Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.

Mitosis is a process of cell duplication, in which one cell divides into two genetically identical daughter cells. In the various stages of mitosis, the cell’s chromosomes are copied and then distributed equally between the two new nuclei of the daughter cells.

The processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation. The first of these processes, ingestion, refers to the entry of food into the alimentary canal through the mouth.

The broadest category in the Linnaean system is the kingdom. Figure above shows the Animal Kingdom because Homo sapiens belongs to that kingdom. Other kingdoms include the Plant Kingdom, Fungus Kingdom, and Protist Kingdom. Kingdoms are divided, in turn, into phyla (phylum, singular).

The crossing over of homologous chromosomes occurs in prophase I of meiosis. Prophase I of meiosis is characterized by the lining up of homologous chromosomes close together to form a structure known as a tetrad.

The breakdown of fat globules in the duodenum into the droplets, which provide a larger surface area on which the enzyme lipase can act to digest the fats into the fatty acids and glycerol is called the emulsification of fats.

Threats to biodiversity differ from one ecosystem to another. In the forest ecosystem, the primary causes of forest loss are commercial exploitation and population growth (including lifestyle and consumption patterns) and the introduction of invasive alien species.