True or false? the poles receive 24 hours of sunlight a day during summer, and zero hours of sunlight during the winter.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Which particle controls what element an atom is?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.