Explanation:
Crossing over is an important section of the normal segregation of the chromosomes in case of the meiosis. Crossing over happens due to the genetic variations, as the genetic materials gets alter at the time of crossing over. The chromatids that are bind together with the help of the centromere do not remain similar in this case. Crossing over gives rise to variation because the alternation takes place between the nonidentical chromatids having different characteristics or traits. Sometimes gives rise to completely new trait which is not present in both the parents this condition makes the . genetic diversity.
<span>Crime Scene Reconstruction
</span>Crime Scene Reconstruction is the method used to support a likely sequence of events at a crime scene by the observation and evaluation of physical evidence and statements made by individuals involved with the incident
<span>NOT:
</span>Confession
Circumstantial evidence
<span>Direct Evidence</span>
The answer is B. Strengthens the
cell wall to allow plants to stand up straight and tall
Lignin is a polymer that
constitutes the cell walls of all vascular plants. It provides the mechanical
support for plants and it supplies the strength and rigidity of plant cell walls.
Structural strength provided by lignin helps large trees to reach heights in
excess of 100 m. In the absence of lignin these trees would collapse on themselves.