Which describes nuclear fission? A. starts when a neutron slams into an atom, causing two atoms to form one, heavier atom

B. starts when a neutron siams into an atom, causing the larger atom to split into two smaller atoms

C. starts when two atoms slam together, causing the larger atom to split into two smaller atoms

D. starts when two atoms slam together to form one, heavier atom

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.

answercells,tissues,organs,organ,system-organism;

levels of biological organization; organism,population,community,ecosystem,biome,biosphere,

hope this .good luck

the peaceful equids (horses, donkeys and zebras) were enslaved by the human race to do our bidding -- sorry, domesticated -- several thousand years ago, and since that time they've been an invaluable resource for transportation, agriculture, warfare, companionship and sometimes-horrifying entertainment.