Which is an example of an external response to stimuli?

a.
a rabbit sensing a predator is approaching

b.
the body recognizing it is constantly feeling thirsty

c.
getting water to drink to quench the body's thirst

d.
a rabbit running from a predator that is chasing it

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Sediment layers stop lateral spreading when: they encounter a barrier they encounter an opposing current they run out of additional sedimentary material