Organisms require certain amounts of food, water, space, and shelter in order to survive and reproduce. If a population of organisms lives in an environment in which water becomes scarce, then water is that population's .
A. carrying capacity
B. limiting factor
C. natural hazard
D. biotic factor

What link in the chain of transmission is described in the paragraph? sarah has been eating and sleeping poorly. she was just diagnosed with pneumonia. tests showed the illness was caused by streptococcus pneumoniae. in the chain of transmission, sarah is the (blank) , and streptococcus pneumonia is the (blank).