How does high biodiversity help the sustainability of an ecosystem?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?