These highly luminous active nuclei are found at the visible edge of the universe and nowhere else. super-red giant stars
galaxies
super-massive blackholes
quasars

The series of transgressions and regressions that produce cyclothems were likely produced by

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis