Ascientist takes some of the genes from one organism and places them into another organism in order to express a desired trait. what is this process called?

Describe the two types of vascular tissue

Describe the layers of the suns atmosphere?

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.