Explanation:
I'm pretty sure it's the plants.
2:1 would be the ratio of boys to girls
Each layer has its own properties, composition, and characteristics that affects many of the key processes of our planet. They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core.
Plant cell have cell wall while animal cell do not.
I hope this help:)
Weathering and Compressing
