Question

Which of the following is an example of a positive feedback?

A low level of oxygen in the blood triggers production of red blood cells, which transport oxygen.

An increase in blood sugar level stimulates the pancreas to secrete insulin, which lowers blood sugar level.

A tear in the lining of a blood vessel triggers the accumulation of blood platelets, which cause blood to clot.

Answer 1

Not 100% but I'm pretty sure it's "A low level of oxygen in the blood triggers production of red blood cells, which transport oxygen." That's the only one that even sounds positive.

Answer 2

Thanks for the medal <3 @YoursTruly