1. in an ecosystem, there are many factors that affect how many organisms can survive there. which of the following is one of those factors?
a. availability of water
b. number of times humans have seen the area
c. color of flowering plants
d. age of mammal species
this is study island.

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.