Habitat Change

A habitat is the natural environment in which an organism lives, providing all the resources it needs to survive, grow, and reproduce.

Habitats provide both abiotic factors (non-living components such as temperature, water, light, and pH) and biotic factors (living components such as food sources, predators, competitors, and mates).

The clownfish requires water temperature and salinity (abiotic) as well as food sources, the sea anemone as shelter, and mates (biotic). Both categories must be present for the habitat to be complete.

The correct answer is both abiotic factors and biotic factors, since a habitat must supply all resources needed for survival, growth, and reproduction.

The question asks which combination of factors a habitat must provide for an organism to survive.

'Only abiotic factors' is incorrect because biotic factors such as food sources and mates are also essential components that a habitat must provide.

'Only biotic factors' is incorrect because non-living factors like temperature and water availability are equally critical — without suitable abiotic conditions, no organism can survive.

'Genetic variation and evolutionary history' describes aspects of evolution, not the resources that a habitat provides. This is not how habitats are defined.

The correct answer is both abiotic factors and biotic factors, which together make up the complete set of conditions and resources a habitat must supply.

The scenario describes a large, continuous habitat being broken into smaller, isolated patches by roads and farmland, while the habitat within each patch still exists.

Habitat fragmentation is defined as the process by which a large, continuous habitat is divided into smaller, isolated patches, typically by human activities such as road building, farming, or urbanisation.

This is not destruction (trees are not removed), not degradation (quality is not described as reduced), and not restoration (nothing is being recovered). The key word is isolated patches.

The correct answer is habitat fragmentation — the habitat is divided but not completely destroyed or degraded.

The question asks which type of habitat change is described when a forest is divided into isolated patches by roads and farms, but the trees within each patch remain.

Habitat destruction is the complete removal or conversion of a habitat. Since the trees inside the patches are not cut down, this is not total destruction.

Habitat degradation means the habitat still exists but its quality is reduced, for example by pollution or overgrazing. The scenario does not describe reduced quality — it describes physical division.

Habitat restoration involves actively repairing or recovering a damaged habitat. Building roads and farms does the opposite of restoration.

The correct answer is habitat fragmentation — the defining feature is the division of a continuous habitat into isolated patches.