Obstructive shock may be defined as the shock that are associated with the physical obstruction of the vessels of the heart. The cardiac tamponade and Pulmonary embolism are included under obstructive shock.
Thrombosis is the blood clot formation in the blood vessels. This has caused the pulmonary embolsim. This is referred as obstructive shock as the heart vessel has been damaged in this case and also shows the cardiogenic shock in the patient.
Well new species can come and live there and some animals may have new food but the disadvantage is some of the animals ill die that lived there because of the changes...i hope this helped you