Hacer la configuración de: Z= 25; Z= 10; Z= 15; Z= 60.

Which of these statements are true about scientific theories and hypothesis

Dna is colied into chromosomes in a cell

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.