Final answer:
In estuaries with little flow and medium salt concentration, halophytes and animals with behavioral adaptations are expected to be found.
Step-by-step explanation:
In an estuary with little flow and medium salt concentration, you would expect to find organisms that are adapted to the specific conditions of this environment. One example of such organisms is halophytes, which are plants that can tolerate salty conditions. These plants have adaptations such as filters in their roots to remove salt from the water they absorb. Another example is animals like mussels and clams, which have behavioral adaptations to function in the rapidly changing environment. These animals can switch from aerobic to anaerobic respiration when exposed to low salinity.