What is the definition of half-life

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

Some animals that try to adapt to climate changes eventually die due to starvation, as climate change alters the web.

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat