During speciation, when do two groups become recognized as separate species? a. when they look different. b. when they are separated by an isolation barrier. c. when they cannot interbreed. d. when they are both herbivores.

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.