What creates the magnetic field in an electromagnet?

a electric current through a straight piece of metal

b magnetic fields around a straight wire

c electric current through a wire coil

d all of these

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

What part of the brain is highlighted in the diagram below?

Crossing over is a method of (blank)?