Which cause of extinction results from humans' direct use of a species?
a. Overexploitation
b. Habitat fragmentation
c. Pollution
d. Introduction of competitors or predators
e. Global warming

Verified step by step guidance

1. Understand the concept of extinction: Extinction occurs when a species no longer exists. It can be caused by natural factors or human activities.
2. Review the term 'overexploitation': Overexploitation refers to the excessive use of a species by humans, such as hunting, fishing, or harvesting, leading to a decline in its population.
3. Compare the options provided: Analyze each option to determine which one directly involves humans using a species. For example, habitat fragmentation involves breaking up ecosystems, pollution involves introducing harmful substances, and global warming involves climate changes, none of which directly involve using a species.
4. Focus on the correct option: Overexploitation is the only option that directly results from humans' use of a species, such as overfishing or hunting for commercial purposes.
5. Conclude the reasoning: Based on the analysis, the cause of extinction resulting from humans' direct use of a species is overexploitation.

Key Concepts

Overexploitation

Overexploitation refers to the unsustainable use of natural resources, particularly the excessive hunting, fishing, or harvesting of species. This direct human activity can lead to population declines and, ultimately, extinction if the rate of removal exceeds the species' ability to reproduce. Examples include overfishing of certain fish species and poaching of endangered animals for their parts.

Habitat Fragmentation

Habitat fragmentation occurs when large, continuous habitats are divided into smaller, isolated patches, often due to human activities like urban development or agriculture. This process can disrupt ecosystems, making it difficult for species to find mates, food, or migrate, which can lead to population declines and increased vulnerability to extinction.

Pollution

Pollution involves the introduction of harmful substances into the environment, which can adversely affect wildlife and ecosystems. Chemicals, plastics, and waste can contaminate air, water, and soil, leading to health issues in species, habitat degradation, and loss of biodiversity. This can contribute to the decline of species and increase their risk of extinction.