Layers of sedimentary rock lay in Badlands National Park in South Dakota. The rocks appear red because they contain hematite, which is formed when iron reacts with oxygen. Explain how this event is related to weathering. Be specific.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides