Secretory pathway refers to the channel through which the secretory organelles secrete proteins to the extracellular compartment.
The polypeptide transport in the secretory pathway involved the transportation of proteins from the ribosomes to the endoplasmic reticulum and then to the golgi bodies and finally to the plasma membrane.
Answer:
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At two points close together toward the upper right of the diagram, since X and Y chromosomes are more advanced.
Yes. Oxygen crash led to Cambrian mass extinction