1. Memory cells that trigger a secondary immune response
2. Specific antibodies that remain concentrated in the bloodstream for life after the first infection event
3. Memory cells that trigger a primary immune response
4. T cells that trigger a primary immune response
Answer:
1. Memory cells that trigger a secondary immune response
Explanation:
During the first infection when the body is invaded by a particular antigen, the immune system tries to identify the type of antigen. B lymphocytes make antibodies when the antigen has been identified in the event of a primary infection. The response of the immune system during the primary infection of that pathogen is usually slow. As soon as the primary infection is arrested by the antibodies produced in response, memory cells such as the memory B cells is formed, which enables the immune system to identify the same pathogen, and thereby triggers a faster secondary immune response in subsequent infections by the same pathogen.
The answer is.
Its cells are widely dispersed and surrounded by a fluid
Answer:
A. Time and space
Explanation:
A body is a particular amount of matter. it can be solid,liquid or gas. It can be described as existing in Time and space.
Brainllst please
Answer:
The answer should be the third option. 'All animals are multicellular heterotrophs'
Explanation:
Answer:
The right option is; A)
Explanation:
The limb bones are similar across these species because they share a common ancestor BEST explains this common skeletal structure.
The three similar bone structures; humerus, ulna and radius that is found in the arm or forelimb of humans, horses, goats, and mice are known as homologous structures. These structures are found in different organisms and because of their similarity suggest that the organisms have evolved from a common ancestor. The structures are usually similar in form but they may not necessarily have the same function in the organisms.
