Which of the following would be an example of positive feedback? thanks! Select one:

Shivering by the muscles when temperature drops.

The attraction of platelets when a wound occurs.

Sweating due to an increase in body temperature.

The reduction of hormone production during pregnancy.

Nucleic acid certain protein cell membranes certain carbohydrates

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.

Discuss cell surface transport in the structure of constituents