Select all that apply: Which of the following are used to describe ecosystem diversity:

A. all extinct organisms

B. all abiotic factors

C. all biotic factors

D. genetic engineering

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it