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Ce qui porte à croire que la vie sur Terre a pour origine une seule et même forme de vie, désignée sous l' acronyme de LUCA pour l' anglais: Last universal common ancestor , qui serait apparue sur Terre il y a au moins 2,5 milliards d'années. En raison du caractère extrêmement vaste du sujet, l'étude de la biologie nécessite un morcellement en domaines d'études. Dans un souci de parvenir à une compréhension plus globale de la biologie, des ponts se sont naturellement créés entre les différentes disciplines.

Permet l'exploration de différents sujets originaux comme la biologie moléculaire, la biotechnologie, la toxicologie, la science biomédicale etc.

Les domaines étudiant la structure du vivant sont à l'échelle de l' atome pour la biologie moléculaire et de la cellule pour la biologie cellulaire.

Le domaine de la biologie moléculaire étudie les composés de bases du vivant, comme l' ADN et les protéines. Pendant longtemps, on a cru que les lois de la chimie régissant le vivant étaient différentes de celles pour la matière inanimée. Mais depuis la synthèse de nombreux composés organiques, il est clairement admis que les lois chimiques sont les mêmes que pour la matière inorganique.

Aucune force vitale n'insuffle la vie à la matière comme on le pensait avant avec la théorie vitaliste. La mise au point du microscope avec lequel Robert Hooke a découvert les cellules en a marqué la naissance de la biologie cellulaire et celle d'un monde alors insoupçonné.

Cette découverte et les nombreuses qui ont suivi ont permis d'expliquer certains phénomènes comme ce que l'on qualifiait à l'époque de génération spontanée. C'est à cette échelle que l'on rencontre les premiers organismes vivants. Prise au sens structurelle et fonctionnelle, la biologie recouvre également l'ensemble des disciplines, classiques et modernes, qui étudient des structures comme les tissus avec l'histologie ou les organes avec l'anatomie. La physiologie quant à elle étudie les principes mécaniques, physiques et biochimiques des organismes vivants et est séparée en deux branches: L'extrême diversité du vivant n'empêche en rien le groupement en entités ou taxons Taxinomie , leurs relations les uns par rapport aux autres et leur classement systématique.

Les interactions des êtres vivants entre eux et les liens les unissant avec leur environnement est le domaine de l'écologie. L'éthologie quant à elle étudie le comportement animal dans le milieu naturel. Les Sciences de la Vie comprennent de nombreuses disciplines et sous-disciplines plus ou moins reliées entre elles et parfois imbriquées.

Ces disciplines sont organisées soit par niveau d'observation, soit par approche méthodologique, soit par type d'organisme étudié. Les applications des découvertes en biologie sont nombreuses et très présentes dans le quotidien de l'être humain. Les avancées importantes de ces dernières décennies en médecine ont principalement pour origine les découvertes sur le fonctionnement du corps humain.

Le domaine pharmaceutique profite également des avancées en chimie organique. Plus récemment, la découverte de la structure de l'ADN et une meilleure compréhension de l'hérédité ont permis de modifier finement les êtres vivants [Comment? La biologie peut également avoir des applications en criminologie.

Dans la Revue française de criminologie et de droit pénal , Laurent Lemasson présente trois corrélations entre biologie et criminalité mises en évidence par différents chercheurs: Une meilleure compréhension de l'évolution moléculaire, substrat physique à l'évolution des espèces, permet de transposer aux humains les découvertes faites sur les animaux, y compris des vers comme C.

Toutefois, les progrès très rapides de la biologie suscitent parfois des interrogations philosophiques , de vives inquiétudes, voire une forte opposition de certaines associations ou organisations non gouvernementales ONG.

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