Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from 8.5 millionths of a metre to 33.6 metres (110 ft) and have complex interactions with each other and their environments, forming intricate food webs. The study of animals is called zoology.
For Animal health, see Veterinary medicine
Health is the ability of a biological system to acquire, convert, allocate, distribute, and utilize energy with maximum efficiency. The World Health Organization (WHO) defined human health in a broader sense in its 1948 constitution as "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." This definition has been subject to controversy, in particular as lacking operational value, the ambiguity in developing cohesive health strategies and because of the problem created by use of the word "complete", which makes it practically impossible to achieve. Other definitions have been proposed, among which a recent definition that correlates health and personal satisfaction.
Welfare is the provision of a minimal level of well-being and social support for citizens and other eligible residents without sufficient current means to support basic needs. In most developed countries, welfare is mainly provided by the government from tax revenue, and to a lesser extent by NGOs, charities, informal social groups, religious groups, and inter-governmental organizations.
You must all advance by taking good care of your health. Only by taking good care of your health, you can gain success. The fact is that if your health is not good, how can you do your service? Taking care of your health is as important as any of the other duties of your life. It is your duty towards your body. If your body does not work, how will you function and advance?
Haidakhan Babaji, The Teachings of Babaji, 9 January 1984.
The only justifiable stopping place for for the expansion of altruism is the point at which all whose welfare can be affected by our actions are included within the circle of altruism. This means that all beings with the capacity to feel pleasure or pain should be included; we can improve their welfare by increasing their pleasures and diminishing their pains.
Peter Singer, The Expanding Circle - Ethics, Evolution, and Moral Progress, Chapter 4, Reason, p. 120 (1981).
What the welfare system and other kinds of governmental programs are doing is paying people to fail. In so far as they fail, they receive the money; in so far as they succeed, even to a moderate extent, the money is taken away.
Thomas Sowell, during a discussion in Milton Friedman's "Free to Choose" television series in 1980.