Adenine and guanine have a fused-ring skeletal structure derived of purine, hence they are called purine bases. ... Similarly, the simple-ring structure of cytosine, uracil, and thymine is derived of pyrimidine, so those three bases are called the pyrimidine bases.
Sebaceous glands.
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The causes of monocultures are the economics of
global product of agriculture, standard of industrial society, and the apparent
“simplicity” of managing only one crop.
The major cause of the loss of top soil is
soil erosion (which is caused by the factors like water, wind and tillage of
farm fields). Loss of top soil become a global problem for agriculture.
<span>A species that are occurring outside of its
normal distribution are known as Alien species. The cause of alien species is
that these species are not native to ecosystem and they can cause harm to the
environment.</span>
Resource partitioning
Resource partitioning refers to differences in resource use
between species regardless of the origin of the differences. Similar species
can coexist in the same ecological community without one pushing the others to
extinction through competition. Species compete for the same resources which
include nutrients and habitats which are the raw materials needed by organisms
to grow, live, and reproduce. For the question given above, the divergence in
lizards is an example of resource partitioning.
Protein-energy malnutrition is a form of undernutrition caused by an extremely deficient intake of calories, protein, or both. Two examples of this type of malnutrition are kwashiokor and marasmus. Protein-energy malnutrition is more often caused by decreased absorption or abnormal metabolism. It is defined as a range of pathological conditions arising from coincident lack of protein and/or energy in varying proportions. The condition vary in forms ranging from mild through moderate to severe degrees.
