Answer:
<u><em>3. cocaine</em></u>
Explanation:
As much as all of these are harmful and tobacco is terrible for you. There aren't any extremely addictive drugs like cocaine. If it was cocaine you would be addicted forever while nicotine will slowly get you addicted and it is possible to get off it.
When you don't have enough platelets in your blood, your body cannot form clots. A low platelet count may also be called thrombocytopenia. This condition can range from mild to severe, depending on its underlying cause. For some, the symptoms can include severe bleeding and are possibly fatal if they're not treated so Your answers is D: Thrombocytopenia
The immune system fights off the pathogen by Leukocytes also known as white blood cells. When a pathogen enters the body the immune system becomes alert to it and sends out sends out the Phagocytes (a type of Leukocytes) which engulfs the pathogens.
The type of immunity that will trigger the defense and reaction in the same manner regardless of the organism invading is : Innate immunity
Innate has a non specific characteristic, which mean that as long as an object is identified as 'foreign' by your body, it will trigger a defense mechanism to eliminate that object
hope this helps