Oxygen was missing in Earth’s early atmosphere
No, because the colder the temperature is, the less water that can exist in an area. The cold air you feel is dry air, therefore humidity most likely won't exist in freezing temperatures. Have a beuatiful day
Answer: False.
Explanation: The Archimedes screw was initially used for removing water from the hold of a large ship, not for moving people.
At the end of the 19th century,
The French biologist Alexandre Yersin discovered the germ Yersina pestis.
Yersina pestis spread the "Black Death". With the help of modern
microbiologist's study with a namatode (C. elegans), genes that may play a part
in the transmission of plague have been identified. Along with this knowledge,
the microbiologists understood that the bacillus travelled from person to
person through the air and from bites from infected fleas and rats. According
to biologist Paul-Louis Simond, the bacteria blocks the digestive tracts of the
fleas and stimulates them to bite and people repeatedly, injecting and
spreading the bacteria. The bacteria hitchhike in immune cells in lymph nodes
and the infection begins and transmits to others. Antibiotics are then chosen to fight the bacteria.
