For a long time, the fact that immigrants from eastern europe, asia, and latin america tended to be shorter than native-born americans was taken as evidence that there were inherent racial differences between these populations. however, the immigrants had children who grew up to be as tall as anyone else. geneticists now tell us that, although there can be considerable variation in height within a group due to genetics, height differences between groups are largely caused by diet. what does this demonstrate?

This showed that diet has influences on frequencies of expression of   genes for height,(20-40%), although genetics control the inheritance (60-80%)

Explanation:

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

the correct answer to this question is #5