WHICH OF THE FOLLOWING OPTIONS ARE TRUE REGARDING THE DIFFERENCES BETWEEN DNA AND RNA??!

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?

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.