Three elements are very reactive nonmetals with similar properties. Where are these elements most likely located in the periodic table?
A. in the same row of the periodic table
B. in the four corners of the periodic table
C. in the two top rows of the periodic table
D. in the same column of the periodic table

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.