Answer:
The temperature is kept at room temperature and mostly preferred to be constant, so that the temperature does't be a variable factor effecting the accuracy of experiment.
Temperature is kept constant to take it as a control factor, so that experimental results are not effected by such outside factors. Such control variables are important in experiments as they minimize the influences from outside.
Polar bodies serve to eliminate one half of the diploid chromosome set in meiotic division in the egg, leaving behind a haploid cell. That means that 23 pairs (46) of chromosomes are going to be separated equally, 23 for the polar body and 23 for the egg cell. In case of trisomy 18, the division is not equal. Instead, the egg cell receives 23 +1 chromosomes and the polar body receives 23 - 1= 22 chromosomes.
That chromosome that was misplaced is the chromosome 18.
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Answer:
Homeostasis. Angiosperms or flowering plants maintain homeostasis by keeping their stomata (opening in the underside of a leaf that allows carbon dioxide to diffuse into and out of the leaf) open just enough to allow photosynthesis to take place but not so much that they lose an excessive amount of water.
I hope this is the right answer and I hope it helped.
-Jarvis
Molybdenum is the element on the periodic table that has 42 as it's atomic number. It has 42 electrons. Hope this helps! =^-^=
