Write a letter to your cousin in another school telling him/her about three benefits
of free shs to students

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What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

How can you tell the difference between rough er from smooth er?