<span>The hypothalamus serves as the regulator or controller of the autonomic nervous system in the brain. The hypothalamus is situated right above the brain stem and is vital for the regulation of many vital functions like respiration, cardiac functions etc.</span>
Answer:B.) Substitution
Explanation: Mutations are permanent changes in the nucleotide sequence of a DNA molecule. Substitution leads to a point mutation if only one nucleotide is replaced by another.
A substitution mutation occurs when one or more nucleotides in a DNA sequence is replaced by another nucleotide.
Example of substitution is in sickle cell hemoglobin in which valine replaces glutamate at position six in the two beta chains of hemoglobin. In a normal hemoglobin, the two beta chains of hemoglobin have glutamate at the sixth position but in a sickle cell hemoglobin, valine is found at position six on the two beta chains. This is also an example of a point mutation.
The five earth's spheres are biosphere, hydrosphere, atmosphere, geosphere and lithosphere.
An organism like polar bear might react with each of the sphere in the following way: The bear has its habitat on the land (lithosphere), he eat grasses and other small animals found in the biosphere. It drinks water, which is part of the hydrosphere. It breaths in oxygen and breath out carbon dioxide into the atmosphere. Its wastes is a source of food to decomposers, ( in the geosphere) which breaks it down for plants' use
Answer:
organic chemistry is the study of molecules that contain Carbon compounds. inorganic chemistry is the study of all compound that does not contain Carbon compounds
Thier are 37.2 trillion
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