Two Species of Lizards, the Canyon Lizard, Sceloporus Merriarni, and the Tree

Multiple Choice

Two species of lizards, the canyon lizard, Sceloporus merriarni, and the tree lizard, Urosaurus ornatus both hunt for insect prey on rock surfaces. In 1976, an experimenter established removal plots, where one species of lizard was removed. Here are the resultant densities of lizards: Urosaurus with Sceloporus 55, Urosaurus alone 80, Sceloporus with Urosaurus 130, Sceloporus alone 129. What can you conclude?

A) There is no interspecific competition.
B) Intraspecific competition is not important.
C) Sceloporus is a better competitor than Urosaurus.
D) Urosaurus is a better competitor than Sceloporus.