Help me guys i em doing a test plz During primary ecological succession, the initial formation of soil helps establish —

C. shrubs
D. trees
A. grasses
B. mushrooms

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

How much energy will be transferred to your eardrum while listening to this sound for 1.0 min?