Question

fish, crabs, and shrimp are considered keystone species in the mangrove ecosystem primarily because they provide what critical function?
they provide nursery grounds for other species.
they provide nursery grounds for other species.
they regulate the local temperature and climate.
they consume all the decaying organic matter.
question 13
1 pts
what is one major anthropogenic influence threatening mangroves?
coastal development
pollution from oil spills and plastic waste
clearing the land
over fishing

Explanation:

First Question (Keystone Species in Mangrove Ecosystem)

In mangrove ecosystems, fish, crabs, and shrimp (keystone species) provide nursery grounds for many other aquatic species. Regulating local temperature/climate is not their role, and consuming all decaying organic matter is inaccurate (decomposers handle that more). The repeated option "They provide nursery grounds for other species" is correct as mangrove habitats with these organisms act as safe areas for juvenile species to grow.

Anthropogenic (human - caused) threats to mangroves: Coastal development (like building ports, resorts) directly destroys mangrove habitats. Pollution from oil spills and plastic waste is a threat but less widespread in causing habitat loss. Clearing land is part of coastal development. Overfishing affects species but not the mangrove habitat structure as directly as coastal development. So coastal development is a major anthropogenic influence.

Answer:

A. They provide nursery grounds for other species (assuming the first option with this text is the identifier, but since two options have the same text, the correct function is providing nursery grounds for other species)

Question 13 (Anthropogenic Threat to Mangroves)