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

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the role of the microscope world in creating new materials .

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.