During ecological succession of an ecosystem new organisms begin to grow and the ecosystem begins to recover. This is the way ecosystems repair themselves after a disaster.
<span>E. Stimulation of T-cell by APC</span>
The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination. However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it and rapidly spring into action triggering a much more rapid response specific to that pathogen than the initial exposure, effectively dealing and neutralizing the pathogen.
The DNA is used by special proteins, called histones to make chromatin. The chromatin condenses even more, then forming chromosomes. This means chromatin is lower order of DNA organization and chromosomes are higher in it.
Answer:
Asexual reproduction in starfish. Asexual reproduction in starfish takes place by fission or through autotomy of arms. In fission, the central disc breaks into two pieces and each portion then regenerates the missing parts.
Explanation:
Answer:
A parasitic relationship is one in which one organism, the parasite, live off of another organism, the host, harming it.