When two massive objects (like black holes) orbit each other, they emit gravitational waves as sometimes their axis is oriented one way and sometimes transversely, creating alternating regions of strong and weak curvature, similar (but not identical) to periodically shaking one end of a string (see gif). If the binary systemrotates one full cycle every 6 days, what is the speed, frequency, and wavelength ofthe emitted gravitational waves

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

a and c

c is 100% but i am confused in a

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.