During prophase 1 of meiosis, crossing over between the sister chromatids occurs. what is the purpose of the process? A. to produce genetic variaton
B. to duplicate the dna
C. to produce the spindle fibers
D. to remove the nuclear envelope

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.