Which of the following spiders are classified as extremely dangerous to people due to their venom?

The classification of spiders as extremely dangerous to humans primarily revolves around their venom and the potential impact on health if bitten. The Black Widow and Recluse spiders are known for producing venom that can cause serious and potentially fatal reactions in humans.

The Black Widow's venom contains a neurotoxin called latrotoxin, which can lead to severe pain, muscle cramps, and neurological symptoms. Likewise, the Recluse spider, particularly the Brown Recluse, has venom that can result in necrotic skin lesions and systemic reactions in some individuals. Because of these dangerous effects, both spiders are closely monitored in areas where they are found.

In contrast, the other groups of spiders mentioned, such as Wolf and Cellar spiders, Orb-weaver and Jumping spiders, and Garden and House spiders, generally do not pose significant threats to humans. Their bites may cause minor irritation but are unlikely to result in severe medical issues. This distinction underscores the specific dangers associated with the venom of the Black Widow and Recluse spiders, confirming them as the correct choice for identifying extremely dangerous spiders.