Answer:
oxygen gas
Explanation:
because oxygen is needed for life on Earth
C. Ice is less dense than water which means water condenses when it freezes allowing the ice in a lake to float on top of the water preventing the water below from freezing.
Answer:
Different diseases are caused by different types of micro-organisms. Microbes that cause disease are called pathogens. It is important to remember that: A pathogen is a micro-organism that has the potential to cause disease.
Answer:
Saudi Arabia, Russia, the United States, and Iran
Explanation:
