1. During meiosis, crossing-over (gene exchange between chromosomes) may occur. Crossing-over usually results in

Crossing over is also referred to as DNA recombination and occurs in prophase I of  meiosis I during cell divisions of sex cells. It is a process by while non-sister chromatids exchange their genetic materials. Crossing over is important in maintaining the genetic variations withing a given population of living organisms. since the composition of genetic material of offspring is different from that of their parents as result of crossing over, they may have some survival advantages not found in their parents.  

Explanation:

answer: no, they are not.*

although rubber bands that contain excessive amounts of dye, toxins, or additives are sometimes toxic, most rubber bands do not cause any health issues. since they are typically made of latex, (a natural substance that is extracted from trees) they are not dangerous in any way if you chew them or accidentally ingest a piece of rubber band. however, chewing rubber bands does pose a choking hazard and is not a good habit to have.

*depending on the type of rubber band. the typical rubber bands that you see at stores are not toxic, but other types of rubber or latex that contains certain chemicals may be unhealthy and hazardous.

answer:

know one knows until they die

Explanation: