Compared to the thickness of Earth, Earth's atmosphere is about the same thickness.
B)
a thin layer surrounding the planet.
C)
a thick layer surrounding the planet.
D)
is about ten times thicker than the Earth itself.

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.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.