Separate Layer it's part of the "Atmosphere layers"
Tertiary
Hope this helps!!!
The answer is 2 . 6-4= 2 3-2=1. 2/1=2
Protozoa are single celled organisms. They come in many different shapes and sizes ranging from an Amoeba which can change its shape to Paramecium with its fixed shape and complex structure. They live in a wide variety of moist habitats including fresh water, marine environments and the soil.
