The process of infection can be broken down into stages, each of which can be blocked by different defense mechanisms. In the first stage, a new host is exposed to infectious particles shed by an infected individual. The number, route, mode of transmission, and stability of an infectious agent outside the host determines its infectivity. Some pathogens, such as anthrax, are spread by spores that are highly resistant to heat and drying, while others, such as the human immunodeficiency virus (HIV), are spread only by the exchange of bodily fluids or tissues because they are unable to survive as infectious agents outside the body.
Answer:
They make smoking more costly.
Explanation:
If taxes are increased, that means people won't buy the product anymore as it's more costly.
Answer:
This statement is true
Explanation:
While this question can appear incomplete, the claim stated is in fact true. There are many people who are deciding that they do not want to vaccinate their children, and this can be bad for herd immunity.
What herd immunity is, is that if 90% of kids in a population are vaccinated (cannot transmit the disease), and they are all spread out, statistically speaking, there is very little chance of that 10% of kids meeting each other.
Answer:
Biological
Explanation:
Major depressive disorder may be defined as a type of mood disorder in which the individual suffers from the long and intense feeling of sadness. This is also known as clinical depression.
The major depressive disorder can be run in the family as well. The biological factor plays an important role in these disorder. The factors like age, sex and other genetic factors are might responsible for the development of the condition of major depressive disorder.
Thus, the answer is biological.
