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<p><strong>1- Use of animals in scientific research<br>
</strong>All kinds of animals, from fruit flies to laboratory mice are widely used in scientific research. Their participation is essential for scientists to learn more about health and human biology, and with this the development of new medicines, treatments and cures is encouraged.&nbsp;</p>
<p>However, from the ethical point of view, animals feel the same pain as humans, and if they accept that they have rights, scientific experiments and tests would be a violation of their integrity.&nbsp;</p>
<p>In this case, the benefits to humanity go to a completely irrelevant role, since it is not known what would happen if there are no more tests on animals, but there is certainty of the damage done to them by performing these tests.</p>
<p><strong>2- Gay marriage<br>
</strong>Those in favor say that equality of rights should be for all, without discriminating by race, religion, sex or sexual option.</p>
<p>In this way, denying the right to marry would be part of the discrimination, since all types of couples - whether heterosexual or homosexual - deserve to have the same legal rights associated with marriage: as property rights, inheritance and adoption.</p>
<p>On the other hand, its detractors consider that the objective of the marriage between a man and a woman is the procreation and maintaining the institution of the family, something that does not happen in the case of homosexual couples and that gives rise to a different type of families , that change the traditional conception of parents, children and home.</p>
<p><strong>3- Euthanasia<br>
</strong>The debates about moral dilemmas of euthanasia are very old. Some of the arguments that have historically been used are the same ones that are used today.</p>
<p>This is why euthanasia continues to be a debate at all levels of society.</p>
<p>Even the act of euthanasia is illegal, even if it happens passively in all the hospitals of the world, every day. On the other hand, medical advances have been able to prolong the life of patients far beyond their possibilities only a few years ago.</p>
<p>There is an ethical difficulty in interpreting adequately and simultaneously the rights of the patient or their autonomy - versus the rights and the work of the doctors. In itself, euthanasia is defined as a deliberate intervention, with the express intention of ending life and thus alleviating intractable suffering.</p>
<p>There are two types of euthanasia, the active one that consists of supplying medicines based on potassium to cause cardiac arrest; or the passive euthanasia that can be, withdraw the vital supplies to a patient that needs them to stay alive or administer high doses of opioids.</p>
<p>Despite this, there are still many people who consider this medical practice illegal and unethical, and an unacceptable facet in the health professions.</p>
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