Answer: 1. Sea urchins and sea otters
2. They are prey for carnivores.
3. Sea otters, star fish
Explanation:
Sea urchins and sea otters are carnivores as they eat on the flesh of starfish and sea urchins respectively.
Starfish feed on the kelp forests which are the producers in the food chain and the starfish is the primary consumer and prey for sea urchins. So, starfish and kelp forests are the prey in the marine ecosystem.
Keystone species is the one which controls the population of other inferior species in an ecosystem. Here, sea otters consume sea urchins so the population of sea urchins remained in control Starfish controls the population of kelp forest.
The definition is the study of life
Answer:
Overthinking it.
Explanation:
Just go with with what you gut is telling you
Answer: Marginal analysis
Explanation:
Marginal analysis is used to evaluate the marginal benefits and marginal costs of reducing pollution.
As the complexity of environmental protection grows, inexpensive and simple ways of mitigating emissions start to decrease, and more costly approaches need to be used and the marginal cost is increasing. Often, marginal benefits are reduced as environmental security increases.
As the amount of protection for the environment rises to, the marginal costs outweigh the marginal benefits. Society is not allocating resources effectively at this stage of environmental security, since so many resources are giving up to reduce emissions.
As the scope of the environmental regulation grows, additional environmental spending will likely result in increased marginal costs.
Hence, marginal analysis is a specific tool used to way the cost of benefit versus cleanup in the environment.
