The answer is <span>c. within the krebs cycle.
Oxygen from the lungs enters the blood through which is transported to every cell of the body. From the cells, carbon dioxide is taken to the blood and transferred to the lungs. Carbon dioxide is produced within the Krebs cycle in the cells. Two reactions of the Krebs cycle give carbon dioxide as product:
1. transformation of D-Isocitrate to </span>α-ketoglutarate,
2. transformation of <span>α-ketoglutarate to Succinyl-CoA.</span>
The given observation in sea urchins implies that new proteins should be synthesized so that the process of cell division can take place.
Sea urchins belong to the phylum Echinodermata. These organisms are mostly preferred by the embryologists for studying the process of cell division because they produce gametes in abundant amount which can be obtained easily. The sea urchins produce eggs as well as embryos which are transparent in nature.
Early cell divisions in sea urchins are fast-paced. Radial holoblastic cleavage can be observed in sea urchins. The proteins that are manufactured during cleavage use mRNAs present in the cytoplasm given by the female parent.
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The answer is C trade slower on the tree develop before traits higher on the tree.