Synapsis and crossing over takes place during synapsis and crossing over takes place during a)metaphase ii of meiosis b)prophase i of meiosis c)prophase ii of meiosis d)metaphase i of meiosis

the answer might be A

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.