Which of the following best describes a dichotomous key?

A. Uses a branching diagram called a cladogram to show relationships

B. Identifies plants by a series of choices between pairs of alternatives

C. is the systematic arrangement of plants into groups and subgroups based on common characteristics

D. Is a type of plant classification which uses a hierarchy system for classification

i think it is c

Explanation:

It seems to be a logical answer.

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

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.