Answer:
Explanation:
Cell specialization is also called cell differentiation. Through this process, specialized cells form from the unspecialized cells. Then many cells are formed and determined to form specialized functions.
The stem cells are the unspecialized cells which form a different kind of specialized cells.
The muscle cells, nerve cells, sperm cells, red blood cells are specialized cells perform different specialized functions. All these cells arise from stem cells. The nerve cells receive impulse, muscle cells can contract, etc.
There are certain inductive signaling genes that send the signal to the differentiated cells. These signaling molecules are called ligands. These ligands move to another cell to produce specialized cells. In other words, there are some transcription factors and genes responsible for such cell differentiation and the formation of specialized cells.
Another example is zygote, which is an unspecialized cell. This is also a totipotent cell that has the potentiality to reproduce different cells.
Reproduction, Heredity, Variety in fitness of population, and variety in characters among the population are all four conditions for natural selection.
It's a reflex to protect your eye.
Answer:
Una conclusión no es repetir las ideas, sino más bien, es una oportunidad clave para hacer énfasis en la idea o punto principal de un escrito. En otras palabras, la conclusión puede ser definida como el momento adecuado para dejar una huella memorable en el lector
Explanation:
