And an experiment which variable changes in response to the manipulation of another variable

Which group of chordates does  notpossess true backbones?                 a.  birds      b.  frogs and toads      c.  lampreys      d.  crocodilians

Collin would like to use the data a coworker has entered in a database. the problem is the coworker's database software is different from collin's. collin should

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d