Cell tracking shows that axolotl cells in a regrowing leg retain distinct roles. ... Salamanders have the ability to regrow amputated limbs. These cells then divide and differentiate into the tissue types needed. The adult tissues are reprogrammed to make these blastema stem cells
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A zygote is the union of the sperm cell and the egg cell . Also known as a fertilized ovum, the zygote begins as a single cell but divides rapidly in the days following fertilization. After this two-week period of cell division, the zygote eventually becomes an embryo.
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oxygen and hydrogen had equal electronegativity.the covalent bond of water molecules would not be polar,and water molecules would not form hydrogen bonds with each other
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