red dwarf
white dwarf
pulsar
black hole
Answer:
The correct answer is pulsar.
Explanation:
Protostar : Its a young star with contracting mass which gains mass from its parent molecular cloud. At this stage fusion process does not start.
Red dwarf: A star having lower surface temperature , luminosity, mass and size than of the sun.
White dwarf : its an ultimate stage for an average mass star like sun . its a small dense star with size relatively equal to planet.
Pulsar : A rotating neutron star that emits beam of radio waves and other electromagnetic radiations.
Black hole: It is region of space time with very strong gravitational pull that even smallest particle or electromagnetic wave is incapable to escape it.
The option 'mix household products together' is not a safety tip when using household chemicals. On the contrary, it can be dangerous due to potential harmful reactions. Other tips suggested are all important for safety (option c).
The option that is not a safety tip for using household chemicals is 'c. mix household products together'. Mixing different household chemicals or cleaners can be very dangerous and can lead to harmful reactions.
Such a reaction can produce harmful gases which can be fatal. Other options listed, a. read the label before use, b. open a fan or window when using chemicals and d. wear protective clothing, are all important measures to ensure safety when handling household chemicals.
Learn more about Household Chemical Safety here:
#SPJ11