False, they are structures for motility and have nothing to do with respiration
Answer:
Selectivity in choosing a mates
Geographic barriers separating subpopulations.
Explanation:
Selectivity in choosing a mates is a factor in which individuals can mate with each other. Some individuals tend to choose a sexual mates that posses some traits or characteristics that attract them to each other and because of the observable character, similar individuals attracted to each other mates.
Geographic barriers separating subpopulations is another factor that make similar organism or individuals to mates.
When there is geographic separations or demarcation between individuals in a species and they are separated from other subpopulations .. They tend to mate with each other in the same geographic location and cannot mate with other subpopulations that is outside their own geographic location. These is common in animals.
Agriculture just became easier. It was much easier and safer than directly hunting, albeit, it wasn’t always as rewarding, but it was much more reliable. If you could hold off until the large crop was fully grown with hunting, you could rely on the large crop while waiting for the next one, and have a berth large growth. In other words, it was more reliable, easier, and could be very lucrative.
Milk generation presently causes much more contamination than it utilized to, mostly because so much of the production is solidified into huge dairy ranches, and transfer of that kind of fluid squander is troublesome without harming adjacent water sources.
