A. Because the Egypt and Indus valley are in the desert, living near a river gave access to a food supply, water and better soil for growing crops. There were better resources to build shelter, and the river provided a safe route of transportation to other areas.
Answer: by influencing the production of hormones
Explanation:
The hierarchical structure within a biosphere can be represented as biological levels of organization of living things arranged from the simplest to most complex are:
Organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
