Aquatic ecosystems are located at the downward portion and is also considered as common properties, hence they are:

• Diverse ecosystems

• Rich ecosystems

• Multi-stressed ecosystems

• Terrestrial ecosystems

When we say that aquatic ecosystems are common properties, it means

• They are shared resources, which are used as if they belong to all.

• One has claim ownership to them.

• They belong to one state.

• Antropogenic activities are controlled.

The following are examples of stresses on aquatic environment, except:

• Physical restructuring

• Endemic species

• Sedimentation

• Deforestation

Enrichment of benthic ecosystems is caused by the release of soluble inorganic nutrients (nitrogen and phosphorus) from agricultural and aquaculture farms. This results in:

• Reduction of diversity

• Absence of opportunistic and pollution tolerant species

• Presence of lower animal life forms

• All of the above

Transfers are movements beyond the present geographical range of a species and are intended to insert totally new taxa into the flora and fauna.

• True

• False

Presence of antibiotics in the environment can lead to resistant strains of bacteria.

• True

• False

Refers to the advantages and benefits that the oceans provide the human perspectives

• Habitat services

• Supporting services

• Human resource services

• Cultural Services

_____ ecosystem services are products and goods for direct human sustenance and spaces and areas that the sea makes available.

• Supporting

• Provisioning

• Regulating

• Cultural

Services obtained from the regulation of ecosystem processes such as climate regulation, hazard regulation, water purification, and waste management, pollination or pest control.

• Supporting services

• Provisioning Services

• Regulating Services

• Cultural Services

Comprise diverse functions which serve the non-material well-being of humankind.

• Supporting services

• Provisioning Services

• Regulating Services

• Cultural Services