Chemokines act as chemoattractants. They lead <span>to the migration of immune cells to an infection site so they can target and destroy invading bodies such as microbes. Hope this helps.</span>
Answer:
The correct answer is biological.
Explanation:
When any pathogen invades the body, it has to pass several lines of defence. The first barrier is the skin and mucous membrane which is a physical and chemical barrier. The second line of defence is the non-specific response by macrophages, neutrophils and interferon. After crossing these two barriers the third line of defence comes into action in which, the B- cells and T-cells act specifically on the pathogen and destroy it.
Answer:
B. Water molecules bond with other water as they are transported throughout a plant.
<u>Answer</u>: Cell
<u>Explanation</u>:
The simplest organization level in all the living organisms including humans is a cell.
All human beings are made up of a cell which forms the lowest level of the organization after which the hierarachy of the organization is as follows :
cells----> tissues----->organs----> organ systems
Therefore, the simplest level of organization in human beings is a cell.
B) they stay the same for many generations