Asexual reproduction is the primary form of reproduction for single-celled organisms such as the archaebacteria, eubacteria, and protists.
reciprocate. 1  to give, feel, etc., in return. 2  to give and receive reciprocally; interchange: to reciprocate favors. 3  to cause to move alternately backward and forward. 4  to make a return, as for something given. 5  to make interchange. 6  to be correspondent. 7  to move alternately backward and forward.
Definition of retreat for Students. 1 : an act of going back or away especially from something dangerous, difficult, or disagreeable The enemy is in retreat. 2 : a military signal for turning away from the enemy He sounded the retreat.