Which of the following occurs first in meiosis? 1. Homologous chromosomes line up in the center of the cell.
2. Chromosomes line up in the middle of each cell.
3. Crossing over between segments of homologous chromosomes.
4. Chromosomes are pulled to opposite poles of the cell.

Crossing over between segments of homologous chromosomes.

Explanation:

Crossing over happens during prophase I of meiosis I

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.