Linnaeus recognized two kingdoms of living things, plants and animals. Why do today's classification systems now include six kingdoms?

The Six Kingdoms. When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells. Today the system of classification includes six kingdoms.

Explanation:

explanation:

mitosis is used to produce daughter cells that are genetically identical to the parent cells. the cell copies - or 'replicates' - its chromosomes, and then splits the copied chromosomes equally to make sure that each daughter cell has a full set.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.