All of the following are examples of erosion EXCEPT:
A The wind in the desert blows sand against a rock.
B A glacier picks up boulders as it moves.
C A flood washes over a riverbank, and the water carries small soil particles
downstream.
D An icy winter causes the pavement in a road to crack

Glaciers picking up boulders is not a type of erosion

Explanation:

The four main types of river erosion are abrasion, attrition, hydraulic action and solution. Abrasion is the process of sediments wearing down the bedrock and the banks. Attrition is the collision between sediment particles that break into smaller and more rounded pebbles. Hydraulic action is the force of water against the banks compressing air pockets into cracks, which expand and fracture the rock over time. Solution is the process of acidic water dissolving soluble sediment.

a- all cells come from pre-existing cells