Cicadas are a type of insect. the song of the cicadas is a sound of summer in many parts of the country. which of the following facts about the cicada demonstrates a pattern observed by scientist.
a. cicada shells can often be seen clinging to tree trunks
b. some species of cicadas emerge from the ground every 17 years
c. male cicadas sing in a very loud, distinctive way.
d. cicadas can damage a young tree when laying their eggs in the tree branches