What are the properties of Ionic compounds and how do these relate to their atomic structure?

When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The strong electrostatic forces of attraction between oppositely charged ions form ionic bonds. The resulting compound is called an ionic compound thus creating compounds that have high melting and boiling points.

What is the meaning of homeostasis? Why is this important in humans?

Homeostasis is the maintenance of a constant internal environment through dynamic equilibria. Homeostasis is important in humans as our bodies can only function effectively within an optimum range of internal conditions such as temperature and pH. It is important so that all our cells function properly.

How does Red-shift contribute evidence to the Big Bang Theory?

Red-shift is consistent with the Big bang theory as it shows that the Universe is expanding. When we look at the spectrum of a distant star, the absorption spectrum is there, but the pattern of lines has moved towards the red end of the spectrum.