This graph is data collected from a species of water snake B

This graph is data collected from a species of water snake. Because these data are for snakes, what key environmental variable must the researchers have controlled across all individual measurements to ensure they were able to compare measurements between snakes (HINT: ectotherm vs. endotherm)? Why is this important? ?

This graph is data collected from a species of water snake. Polluted Site A Reference 12 11 10 9 5 Hopkins et al., 1999 20 40 60 80 00 120 140 160 180 200 MASS (g) Fig ciata inhabiting a coal ash-polluted site and a reference site plotted against body mass (g) 8 and 17, respective Polluted site ml Om/h 1.00 0.021 (mass); reference site: 1 On/h 1.06 0.012 ml

Solution

The oxygen uptake increases in proportion to the body mass and oxygen uptake per kg is independent of body mass.Oxygen consumtion of water snakes inhabiting a coal ash-polluted site is less compared to water snake inhabiting a reference site which is more.This clearly indicates that the polluted site there is less oxygen uptake because of the pollution and less dissolved oxygen compared to lithtrophic lake.

Another aspect is regarding the ectoderm and endoderm. Endotherms are those animals which produce their own heat and are warm blooded having exceptions like reptiles and mammals.However ectotherms rely on environmental heat and are cold blooded. When this is related to the water snakes, the reptiles being ectotherms rely on the environment for the heat and thus less amount of oxygen is consumed.