A pair of parallel helices intertwined about a common axis, especially that in the structure of the DNA molecule.
that is the definition^
An example of refraction<span> is when </span>waves<span> approach a straight shoreline at an angle. The part of the </span>wave<span> crest closer to shore is in shallower water and moving slower than the part away from the shore in deeper water. The </span>wave<span> crest in deeper water catches up so that the </span>wave<span> crest tends to become parallel to the shore.</span>
Answer:
I think it's D. Karst Topography
Explanation:
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions.
Biogeochemicle cycles are the pathways by which a chemical substances (carbon, nitrogen, oxygen, phosphorus) moves through biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments.
Organic carbon is found in all land-living organisms,, as well as soils in form of the calcium carbonate. Plants and animals(including humans) utilize carbon to produce carbohydrates, fats, and proteins, which are then be used to build their internal structures or to obtain energy. Carbon is released into the air through the processes of respiration in a form of CO2.
The negatively human impact on the carbon cycle is through direct emissions from burning fossil fuels (transfer of carbon from the geosphere into the atmosphere) or through the process of calcination of limestone for clinker production, which releases CO2.
