In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
A series of paired statements that describe that various physical characteristics of different organisms is called DICHOTOMOUS KEY OR TAXONOMY KEY
The physical features, since they have fur it was obviously cold. Since they had tusks they were constantly hunted.
Answer:
are heterotrophs.
Explanation: This means they eat things outside of themselves instead of producing their own food.
Answer:a
Explanation: because naturally it occurs anytime it wants to
