Answer: Ptolemaic system, also called geocentric system or geocentric model, mathematical model of the universe formulated by the Alexandrian astronomer and mathematician Ptolemy about 150 CE and recorded by him in his Almagest and Planetary Hypotheses. The Ptolemaic system is a geocentric cosmology; that is, it starts by assuming that Earth is stationary and at the centre of the universe. The “natural” expectation for ancient societies was that the heavenly bodies (Sun, Moon, planets, and stars) must travel in uniform motion along the most “perfect” path possible, a circle. However, the paths of the Sun, Moon, and planets as observed from Earth are not circular. Ptolemy’s model explained this “imperfection” by postulating that the apparently irregular movements were a combination of several regular circular motions seen in perspective from a stationary Earth.
Explanation:
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Answer:
Six pairs of chromatids.
Explanation:
There are six chromatids pair present if there are 3 homologous pairs of chromosomes because in each chromosome two chromatids are present. A chromatid refers to two identical halves of a replicated chromosome. Each chromatid has two arm like structure called telomere and these two chromatids are attached to one another from a point called centromere. So we can conclude that three pairs chromosomes have six pairs of chromatids.
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