Answers:
1. Estruaries
2. Rivers
Hope it helped you.
-Charlie
Answer: Species stay the same for a long time and then
change quickly due to environmental changes.
A punctuated equilibrium theory
states that
individual species tend to stay the same or no change over a long period of
time and then enter a period of rapid change due to environmental changes,
which gives rise to new species. Moreover, it generally applies to sexually
reproducing organisms but other biologists have applied the model to non-sexual
species like virus.
The start from an are of high concentration to an area of low concentration until it's evenly spread out
Go to this link it gives a answer through a presentation it is really helpful
https://prezi.com/vwpl6mnqnikg/what-affect-will-adding-soap-to-water-have-on-surface-tension/