Question

which human activity (anthropogenic influence) can upset the food chain by causing some animals to not have enough to eat?
fishing
exploration and recreation
pollution
development (building houses and roads)
question 36
1 pts
what is a key physical characteristic of kelp forests that allows it to thrive in its underwater environment?
it is flexible to bend with the waves.
it can only grow between 30 - 60 centimeters tall.
it is rigid and stands completely straight against all currents.
it must be dark brown to olive green.

Explanation:

First Question (Human Activity Upsetting Food Chain)

Fishing involves removing fish from aquatic ecosystems. If overfished, predators that rely on fish as prey may lack sufficient food, disrupting the food chain. Exploration/Recreation has less direct impact on prey availability. Pollution harms habitats but not always directly by reducing prey quantity. Development affects habitats but the primary food - chain disruption via prey shortage is more linked to overfishing.

Kelp forests are in underwater environments with waves and currents. Being flexible to bend with waves helps them survive these forces without breaking. They can grow much taller than 30 - 60 cm, so the height option is wrong. Being rigid against currents would lead to breakage, and color (dark brown to olive green) is not a physical characteristic aiding survival in the underwater environment (related to light absorption for photosynthesis but not survival against water movement).

Answer:

A. Fishing

Second Question (Kelp Forest Physical Characteristic)