The nucleus of the atom contains what subatomic particle(s)?

protons only
neutrons only
electrons only
protons and neutrons
protons and electrons

Although there are a limited number of amino acids many different types of proteins exist because..

Why does bubbling occur when vinegar mixed with baking soda

In pea plants, yellow seed color (y) is dominant and green seed color (y) is recessive. based on the punnett squares, what are the chances that the offspring in the second generation will have green seeds?