Mutation are two types somatic and germ cell mutation...as there is mutation in germ cell it will alter the normal behavior and produce variation !
random fertilization also causes variation as different setup of genes meets with another different...so chances of variation increases !
and third crossing over is in meiosis when chiasmata forms....so in this two homologous chromosome attach to each other and on separation ... some part exchange so leads to variation !
All of the above is the answer
<h3>
Heya</h3><h3>
Here is your answer</h3><h3>
________________</h3><h3>
</h3>
All Eukaryotic cells contain small bodies known as <u><em>Centrioles
</em></u>
<h3>
==================</h3><h3>
</h3><h3>
Hope this helped !!</h3><h3>
Happy to help :)</h3><h3>
#BeBrainly</h3><h3>
</h3>
<h3>
</h3>
First let me say this, i may be wrong. I think it would change over time because first of all the sandstone has different densities. Different kinds off rocks erode and get broken down by the wind at different rates. If its density is higher, it will take longer to erode
