Red blood cells are red due to the presence of
haemocyanin
haemoglobin
serotonin
epinephrine
Guard cells help plants to
Photosynthesis
Respiration
Water regulation in cells
All the above
The function of red blood cells is
to defend the body against harmful infections
to transport oxygen and carbon dioxide
to clot the blood in time of injuries
to produce white blood cells
Immunization is brought about by:
Injecting medicine against the disease
Keeping personal hygiene
Keeping the surroundings clean
Injecting germs itself.
Bacteria was first observed by
Theodore schwann
Leeuwenhoek
Virchow
M.J Schleiden
The eradication of smallpox has been certified by WHO in the year
1979
1976
1989
1986.
