An aspect of city life that might catch a human ecologist's attention is the width of the sidewalk. This is because of its significant implications for streetscape design and the quality of the pedestrian environment. A sidewalk should have adequate space to allow pedestrians to move safely and comfortably.
I think it could have happened by coincidence. For example, they were eating something, and they dropped that seed in the ground next to the house. After that they noticed that the same plant grew when they threw the seeds. Also they could have noticed that the plants grow from the seeds and they connected this idea with the fact that they threw the seed someone.
Answer: The answer is A.4
Explanation:I hope this helped.
Plasma is the liquid component of blood
