Which of the following suggests that a physical change has taken place in an ice cube

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

What best discribes the relationship between wavelength and frequency in a electromagnetic wave