When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. This would make the answer be.... A. a chemical signal is released
Answer;
Antibodies.
The human immune system fights infection by releasing antibodies.
Explanation;
The immune system acts to defend the body against pathogens such as viruses, bacteria and fungi that may cause a disease.
It does so using various types of mechanism, one is by the production of antibodies.
Antibodies are proteins that are produced by the B-cell and are used by the immune system to identify and neutralize pathogens.
These antibodies also activates proteins known as complements which assist in the killing of bacteria, viruses and the infected cells.
The main function of DNA polymerase is to make DNA from nucleotides, the building blocks of DNA. There are several forms of DNA polymerase that play a role in DNA replication and they usually work in pairs to copy one molecule of double-stranded DNA into two new double stranded DNA molecules.
Answer:
The system of measurement that is used through out the world is know as <u>International System of Units or, in French, Système International (SI).</u>
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Explanation:
In order to describe motion, scientists use SI units to describe the distance an object moves.
<u>In system international (SI) or metric units, motion involves the units meters and seconds. </u>
Due to the consistency of units used the information described by one individual in a country is easily understandable by someone else in a different country .
For example: if someone describe the speed of an object to be 30 meters per second, anyone using the same units can understand this. whereas , the use of units such as foot per second is understandable to only small number of countries