What is it called when earth’s magnetic poles change places?
a.
a strike-slip fault
c.
sea-floor spreading
b.
magnetic reversal
d.
continental drift

The correct answer is option B, magnetic reversal

Explanation:

It is during the magnetic reversal that earth changes it magnetic poles. The earth’s magnetism is caused by the fluid motion of the magnetic liquid in the  earth’s core.  New magnetic fields are created by the twisting and shearing of the existing magnetic field which causes the buoyant fluid to rise in curved trajectories to form dipoles. Most of the time the dipoles remain properly aligned but some times the dipole part of the field reverses, causing the locations of the north and south magnetic poles to switch. thereby causing Magnetic Reversal

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

answer: a) a compound microscope has a greater magnification ability than a simple microscope.

explanation: