7. What is the main difference between the body plan of ticks and that of insects?

Ticks may look like insects but there are distinct differences in their bodies that puts them in the arachnid family. First, is that they have four pairs of legs, so eight total. Insects only have six legs. Second, insects have three body segments, while ticks don't have any (spiders have two body segments).

Explanation:

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

the answer to your question is:

c. complementary base-pairing