The pollutants in 1970 were the highest since recorded history and are declining steadily.
By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
D because destroying toxens and destroying tissues are caused by bacteria
Chromosome is the answer because it is