Calculate the wavelength of a photon that has a frequency of 3.0 x 10^12 Hz.

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 is the subscript for oxygen in its molecular formula

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?