Which of the following lack vascular tissue?

Balantidium coli is the only ciliate known to cause disease in humans

Indicate whether the statement is true or false

The Intergovernmental Panel on Climate Change reported in 2007 that atmospheric carbon dioxide levels will nearly double by the end of this century. If this happens, what will be the atmospheric concentration of carbon dioxide?

A. 1.5 ppm B. 1.75 ppm C. 385 ppm D. 560 ppm E. 700 ppm

What type of net caused many dolphins to drown while tuna were being fished?

a. Purse seines b. Trawl nets c. Drift nets d. Gill nets

According to Darwin, natural selection is based on the ____ found in populations

a. acquired characters b. variations c. weakest members d. noncompetitors e. similarities