It is true that Urban sprawl covers land once used for food
production and destroys ecosystems. Many of the large cities that have come up
were once fertile lands for irrigation or were big jungles. These jungles were
cut down or the fertile lands destroyed to build cities and industries.
By the United States Census Bureau standards, a population
of 1000 people define an urban area is completely false statement. As per the
United States Census Bureau, more than 50000 people define an urban area.
Answer:
The correct answer is b. Neutrophils
Explanation:
Neutrophils are the cells that first reach to the infection side and kills the bacteria. Neutrophils comprises most part of WBCs approximately 50-70% of total WBCs. Neutrophils kills the foreign bacteria by engulfing them and this process is called phagocytosis.
The engulfed bacteria is called phagosome and phagosome then fuse with lysosome making phagolysosome. Now fused lysosome secrete lytic enzymes like proteases, lipases and glycosidases which kills the engulfed bacteria by digesting them.
So neutrophils will be the first cells migrates to prevent bacterial infection in the hand of 20 year old boy who shoots his hand with nail gun.
