The bond between oppositely charged ions is a(n) bond. a. ionic b. polar c. hydrogen d. covalent

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

What layer of the atmosphere is directly above the troposphere?