The correct answer is horizon.
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Transcription takes place in three steps: initiation, elongation, and termination. The steps are illustrated in the Figure below. Initiation is the beginning of transcription. It occurs when the enzyme RNA polymerase binds to a region of a gene called the promoter.
D; Hardy- Weinberg requires a very large population size so that genetic drift can be insignificant.
Answer:
Lower esophageal sphincter
Explanation:
The biological valves are the muscular structures composed of the smooth muscles which form thick tubular structure to allow the controlled movement of any material through it. The valves in the digestive system are known as the sphincters.
The sphincters control the unidirectional movement of the eaten food, chyme and the bolus in the digestive tract.
A sphincter is present at the lower portion of the oesophagus (food pipe) which contracts to prevent the backflow of the food from the stomach and since the sphincter is present at the lower side of the oesophagus, therefore, is known as the lower esophagal sphincter.
Thus, Lower esophageal sphincter is correct.
The process of fusion is when two atoms combine to form a lager atom, releasing energy.
Fusion is defined as the mixing of two lighter nuclei to form one bigger and heavy nuclei. For example, two atoms of hydrogen combine together to form the helium atom. It is also termed as transmutation, as one form of element is transformed into another.
An atom is the smallest unit of any substance. It cannot be further broken down into simpler units. The composition of an atom includes various subatomic particles. These are: a nucleus surrounded by various electrons. Nucleus itself is made up of two subatomic particles: protons and neutrons.
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