We can't answer questions from printed/copyrighted materials. You could ask about each item you have in mind separately.
Not necessarily. A rhombus is an equilateral quadrilateral but does not have a line of symmetry. An irregular octagon does not, either.
Alektorophobia is the fear of chickens; particularly the eggs and feathers either alive or dead.
7 divided by any positive number (not necessarily an integer) smaller than 10 or any number larger than 7 (not necessarily an integer) divided by 10. Equivalent fractions of either set of the above numbers.
Yes. A vector is defined as having magnitude and direction (in reference to a fixed frame). Changing either of these properties redefines the vector.
No, not necessarily. Think of a rhombus that is not a square. Its opposite angles are equal - either both acute (sum < 180) or both obtuse (sum >180).
It's either a type of dance, or someone is insulting you. The insulting definition means that you're very foul or disgusting. A synonym would be like crud/crap/shit/etc...
It does not necessarily prank someone particularly. If you select either button, you will set out the selected "prank can". After you click it, it will blow up and streamers, paint, etc. will come out. The prank can is not that amazing for the cost.
Power
It is not an omen, it is not even particularly lucky either
Skimming is used to scan over parts in a book that aren't necessarily important either to the book or to you.
They might not be great, but they're not particularly bad either.
Not necessarily. A rhombus is an equilateral quadrilateral but does not have a line of symmetry. An irregular octagon does not, either.
Not necessarily as there are different situations that may mean that a child does not live with either of their parents.
It is common and acceptable to refer to a sibling using either a given name (Robert, William, Michelle) or a typical family assigned nickname (Bob, Bill Chelly), as long as the nickname is not derogatory or insulting.
Well i find that very insulting as amom. Either you are very angry at your mom or you really want a dog and your mom will not let you have one. Either way there are other ways to express your anger. I would recommend calmly explaining to your mom why you want a dog and then maybe you would have a chance. :)
TO fall or fallen
It's not particularly common, but not unheard of either.