describe how scientists choose the kingdom in which a eukaryote belongs.

There are four eukaryotic kingdoms, these are animalia, plantae, protista and fungi. Different living organisms are placed under each kingdom based on similarity in their characteristics. In order to determine which animal belongs to which kingdom, scientists have to ask certain questions about the organism. For instance, they need to find out if the organism has only one cell or many cells, if can produce its food or not, if it reproduce asexually or sexually, etc. The answers to these questions will show the scientists the kingdom that the organism belongs to.

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.