it is the 2nd one because there is always a way to filter or change it back to its original format if it has been used
They both reproduce and have to do something with life
Bioluminescence<span> I think thats what it says in my book</span>
<span>Yellow marrow fills the canals of long bones, and red marrow is found in the rounded ends of long bones (for example, the femur). Red marrow is made up of components of blood (red & white blood cells, platelets), while yellow marrow is primarily composed of fat cells.</span>
Answer:
Pepsinogen is produced by chief cells and is activated by hydrochloric acid secreted by parietal cells.
Explanation:
Pepsinogen is a proenzyme produced in the chief cells (that are located in the stomach lining) that, when gets activated, is transformed into pepsin - a peptidase with the function to degrade proteins into amino acids.
The reason why pepsinogen is released inactive is that it would break down all of the cell's proteins because of its proteolytic nature. For this reason, it is released as a proenzyme and gets activated when reaches the acidic environment provided by the hydrochloric acid secreted by the parietal cells, also in the stomach lining.
