Most multicellular organisms have two sets of chromosomes; that is, they are diploid. These chromosomes are referred to as homologous chromosomes. If both alleles<span> at a </span>gene <span>or locus on the homologous chromosomes are the </span>same<span>, they and the organism are homozygous with respect to that </span>gene<span> or locus.</span>
The burning of fossil fuels releases carbon dioxide and other greenhouse gases these carbon emissions raise global temperatures by trapping solar energy in the atmosphere.
