Question

which factors caused the rapid decline or decrease of the sierra nevada yellow - legged frog population? check all that apply.
□ fish
☑ fungus
□ pesticides
☑ uv radiation
□ pollution

Explanation:

The Sierra Nevada yellow-legged frog population decline is driven by multiple biotic and abiotic factors. Introduced non-native fish prey on frog tadpoles and compete for resources. The chytrid fungus causes lethal infections in amphibians, contributing heavily to declines. Increased UV radiation (from ozone layer changes) harms frog eggs and larvae that lack strong defenses. Pesticides drift into their habitats, causing toxicity, and pollution degrades their aquatic environments.

Answer:

• fish
• fungus
• pesticides
• UV radiation
• pollution