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Encouraging early marriages does not help in population control; instead, it increases birth rates and related health risks. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Health and Disease, Topic: Immunity, diseases and health maintenance.
Mutation rate affects genetic variation but does not directly regulate population density like birth rate, death rate, and migration.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Attributes - Birth Death Sex Ratio Age Distribution
Territoriality is biotic because it arises from interactions among organisms, and it is density-dependent because encounters and exclusion become more frequent as abundance rises. Once available territories are occupied, newcomers may be prevented from breeding or forced into poor habitat. This lowers recruitment or raises dispersal and mortality, creating negative feedback on population growth. Population regulation concerns feedback, not mere limitation. A drought may sharply reduce numbers yet fail to push the population toward a repeatable equilibrium. Competition, disease, territoriality,
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 5
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