Answer:
(d). B-cells.
Explanation:
Adaptive immunity can be described as immunity which develops in response to exposure to a pathogen (or foreign molecule). throughout the life. It is divided into two types, humoral immunity and cell-mediated immunity.
Humoral immunity is mediated by B cells that secrete antibodies against particular antigens. These antibodies recognize and neutralize the antigens and activate cell-mediated immunity, which is mediated by T cells.
Thus, the correct answer is option (d).
Answer:
The answer is I ,II and III
Answer:
Modern theory of evolution explains that "organisms change over time as a result of changes in heritable physical or behavioral traits". Hence this change suggests the loss of vestigial organs.
Explanation:
- Vestigial organ are those which do not have any function but is present in our body.
- According to the modern theory the genetic and physical appearance changes along with the adaptation in environment by the organism.
- So if the organ looses its function in order to sustain and adopt in the changing environment then they become vestigial and slowly disappear.
- This is the common example for the Lamarck's theory of "use and disuse".
Answer:
interaction between two different organisms living in close physical association, typically to the advantage of both.
Explanation:
