Hydrogen bonds i hope that helps
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it is important because if their aren't any mutations then animals that find themselves in a new environment will die, and without it scientists cant study it so that they can help animals or humans.
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THE ANSWER BELOW and i really hope this is the answer your looking for if not i am sorry
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A. Brain - Organ level
B. Neurons - Cellular level
C. Neurotransmitters - Chemical level
D. Neurons and neuroglial cells - Tissue level
E . Brain combined with the spinal cord and spinal nerves - Organ System level
There are five levels of organisation of life; cell, tissue, organ, system and organism.
The smallest unit is cell. Neurons are nerve cells.
Aggregation of cells forms a tissue. Neurons and neuroglial cells aggregate to form nervous tissues and are hence at tissue level.
Aggregation of tissues forms an organ. Brain is an example of organ. It is formed from aggregation of nervous tissues.
Tissues aggregate to form organs while aggregation of organs constitute a system. The nervous system consist of brain combined with spinal cord and spinal nerves.
The nervous system release chemicals called neurotransmitters.
Answer:In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
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The Y chromosome contains a "male-determining gene the SRY gene, that causes testes to form in the embryo and results in development of external and internal male genitalia.
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