The Spanish Flu of 1918 occurred during World War I and killed between 30 to 50 million people worldwide. Which best explains the spread of this virus?
The Spanish Flu quickly became a pandemic due to the close quarters and distances traveled by troops.
The Spanish Flu quickly became an epidemic due to the close quarters and distances traveled by troops
O The Spanish Flu quickly became a pandemic due to the lack of antibiotics and poor hygiene of the troops.
o The Spanish Flu quickly became an epidemic due to the lack of antibiotics and poor hygiene of the troops.

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Can someone i have no idea of how to do this.

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits