What does the law of
magnetic attraction state?
a. opposites attract.
b. opposites repel.
c. the mass of a magnet increases.

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine