Among song birds, a -crystallized- song is one that
A) is high pitched.
B) is aimed at attracting mates.
C) extremely young chicks sing.
D) is the final song that some species produce.
E) warns of predators.
Answer: D
Among song birds, a -crystallized- song is one that
A) is high pitched.
B) is aimed at attracting mates.
C) extremely young chicks sing.
D) is the final song that some species produce.
E) warns of predators.
Answer: D