The is a membrane-bound organelle that contains an organism's genetic material and control and regulate cellular processes.

Landfills are waste disposal sites. they are often man-made depressions in the ground covered with a lining designed to prevent any leakage of waste materials. however, landfills can leak through the base resulting in negative impacts on the surrounding environments. what negative impact to the environment is caused by organic and inorganic constituents that are dissolved by rainfall in the landfills?

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?