Wings would be different in human and pigeons.
The society makes laws to restrict some researches, is the right answer.
In the context of the modern world; where every day new inventions are taking place, it becomes necessary for the government and the society to take some measures to control science. When the society found science harmful like euthanasia, unethical (abortion) or threatening, society makes laws to restrict some research; as these spheres closely associated with culture, religion, and society.
There are 4 bases:
Adenine,
Thymine,
Guanine,
Cytosine.
This is because not all genes are expressed at the same time, so not all the proteins are present at a certain moment. The mechanisms that cell uses to control gene expression are called regulation of the gene expression. Thanks to regulation of the genes, cells have the ability to increase or decrease the production of specific gene products such as proteins. This property is important for the adaptability of an organism because it allows the cell to express protein when needed.
