An imaginary wall or divider.
Good luck on your permit test!
I would say
O sediment flowing down a slope
These changes can be caused by environmental factors such as ultraviolet radiation from the sun, or can occur if an error is made as DNA copies itself during cell division. Acquired mutations in somatic cells (cells other than sperm and egg cells) cannot be passed to the next generation.
:333
<span>The parent cell undergoes one round of DNA replication followed by two separate cycles of nuclear division. The process results in four daughter cells that are haploid, which means they contain half the number of chromosomes of the diploid parent cell</span>
The sequence of species in which they disappear, in order from least to most severe would be: B. Threatened-Endangered-Extinct.
Hope this helps!
