Describe the three main properties that scientists measure when they study populations

Animals such as pronghorn antelope, bison ans badgers dot to the landscape. where are these animals located?

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Which animal is a producer in this ecosystem