Question

1. which of the following is a primary greenhouse gas? a. carbon dioxide b. nitrogen c. helium d. oxygen 2. what is one consequence of air pollution? a. water purification b. soil erosion c. respiratory problems d. increased biodiversity 3. the concept of ecological balance in ecosystems is closely related to: a. the interconnectedness of species and their environment b. urbanization c. agricultural development d. economic growth

Explanation:

1. Carbon dioxide is a well - known primary greenhouse gas that traps heat in the Earth's atmosphere. Nitrogen, helium, and oxygen are not primary greenhouse gases.
2. Air pollution can cause respiratory problems as harmful substances in polluted air can irritate and damage the respiratory system. Water purification is not a consequence of air pollution, soil erosion is mainly related to factors like deforestation and improper land use, and air pollution generally reduces biodiversity rather than increasing it.
3. Ecological balance in ecosystems is about the interconnectedness of species and their environment. Urbanization, agricultural development, and economic growth can disrupt ecological balance rather than being closely related to the concept of maintaining it.

Answer:

1. a. Carbon dioxide
2. c. Respiratory problems
3. a. The interconnectedness of species and their environment