What is required for reactions to form bonds?

The bond energy required to break down a bond is dependent on the type of bond. The stronger the bond, the greater amount of energy needed to destroy it. Because covalent bonds are strong, bonds do not spontaneously break down in nature without the application of bond energy. The bond energy can come from different energy sources, such as heat. Endothermic reactions are chemical reactions where heat is absorbed to apply the bond energy necessary to destroy the bond and change the compounds.

Chemical bonds do form spontaneously because atoms are naturally unstable and reactive. The type of bond they form depends on their electronegativity. Smaller differences in electronegativity result in covalent bonds and greater differences result in ionic bonds. The attraction and intermolecular forces of the bonds determine their strength and bond energy. Because chemical bonding involves the transfer of energy, such as atoms donating and receiving valence electrons in ionic bonds, it results in exothermic reactions, or reactions that give off heat energy.

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.