Which of the following is a star that expands due to fusion?
a. black hole
b. galaxy
c. constellation
d. supergiant

What is the equilibrium constant of aa+bb=cc+dd

How might this scientific phenomena be explained? a paper clip floats on water.

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon