Tiger frogs have similarities in their mitochondrial DNA that are not shared by other frog species
The pulmonary vein brings the oxygenated (clean) blood to the left atrium.
Pls mark this as the brainliest
Answer:
The correct answer would be thrombin.
The last step in the blood clotting is the formation of a fibrin clot.
Thrombin is the serine protease (protein) enzyme which activates fibrin.
It converts the soluble fibrinogen into the insoluble fibrin which then results in the blood coagulation.
I believe the anwser you are looking for is the
Cell Membrane.
It is a substance that lets things in and out of the cell
