Amouse sees a hawk fly overhead. the mouse then runs into the nearest hole in the ground. what is the hawk flying overhead in this scenario?
a)a stimulus
b)a response
c)a developmental change
d)a unicellular organism

The hawk flying overhead is a stimulus because this caused the mouse to run into the hole.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: