Pathogen

Direct transmission

Indirect transmission

Transmission

Vector

Callose

Inflammation

Mucous membrane

Primary defences

Antigen-presenting cell

Clonal selection

Cytokines

Neutrophil

Opsonins

Antibodies

B memory cells

Clonal expansion

Plasma cells

T helper cells

T killer cells

T memory cells

T regulatory cells

Agglutinins

Anti-toxins

Primary immune response

Secondary immune response

Active immunity

Artificial immunity

Natural immunity

Passive immunity

Vaccination

Biodiversity

Habitat

Species

Species evenness

Species richness

Keystone species

Soil depletion

Conservation in situ

Conservation ex situ

Phylogeny

Natural selection

Continuous variation

Discontinuous variation

ENvironmental variation

Genetic variation

Interspecific variation

Intraspecific variation

Anatomical adaptations

Behavioural adaptations

Physiological adaptations