These activities change heart rate by changing the balance of parasympathetic and sympathetic stimulation of the heart. sort each of the activities according to whether it decreases or increases heart rate. drag the appropriate items to their respective bins. hints reset digesting a meal standing up exercise fight or anger lying down decrease heart rate increases heart rate

Some species of hummingbirds have different shapes of beaks that evolved to allow them to drink from certain flowers. the flower species have evolved to produce nectar that is tasty for the hummingbirds. this example is a type of . cuckoos lay eggs in the nests of other birds. the cuckoo lays eggs identical to the eggs of the host species, so the other bird takes care of it. this is an example of .