Section A: MCO (10 Marks) 1. Which of the following does not explain why the windows of the science laboratory should be
opened?
A. To let fresh air into the laboratory.
B. To prevent the laboratory from becoming too hot when all the Bunsen burners are on
C. To prevent accumulation of irritating fumes and gases.
D. To allow teachers to check on misbehaving pupils.​

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

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

The cluster of developing cells from conception until birth is called an