Answer: make objective observations.
Explanation:
Density-Dependent:
1<span><span><span><span>. </span>competition.</span><span>
<span>2. </span>overcrowding.</span><span>
3<span>. </span>predators.</span></span><span>
(These are a few from a test I took, hopefully they help you a bit >.<)</span></span>
They are trailing the same speed as it states in the question they are heeding toward each other a 70 mph <span />
The fourth dimension is technically time. the fourth dimension that you are talking about is actually impossible to comprehend.
