Random genetic mutations occur to help organisms better survive and
reproduce (fitness), the more fit an organism is, the more likely it will
survive. These mutations result in traits (like more fur) that could be
beneficial, or traits that could end up not being beneficial (skin cancer).
But natural selection can only act on traits that already exist in the
population. Which statement best expresses how variable traits (perhaps
only seen in a small fraction of the population) become adaptations seen
in a majority of the population? *

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.