Two atoms that have the same chemical characteristics but different atomic masses are considered ​

this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.

it creates acid rain

i think that it is c, d, and e, hope this

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.