The illustration below shows the steps of meiosis I.

The steps of meiosis 1 are shown. In step A, the chromosomes pair up. In step B, the homologous pairs line up for separation. In step C, the pairs are separated. In step D, sister chromatids stay together. In step E, 2 new cells are formed.

What is the step that is labeled D?
metaphase I
metaphase II
telophase II
telophase I
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According to the illustration of meiosis I, when sister chromatids stay together the phase to which it corresponds is telophase I (fourth option).

Explanation:

Meisois is a process of cell division whose final result is the obtention of two daughter cells with half of their genetic charge, with respect to the original cell. This process is divided into two parts, called meiosis I and II.

Telophase I corresponds to the phase of cell division in meiosis I, where the events that occur are the appearance of the nuclear membrane on the newly divided genetic material, cytokinesis -or cytoplasmic division- and above all due to the fact that each daughter cell already contains half of the genetic load, since the sister chromatids stay together.

Learn more:

Meiosis link

the real answer is b. scintillation counter

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.