Answer:
Because of their own bias and prior understanding and knowledge. Hope I helped!
Ecology gives all species including us; food, water, shelter, and so on.The smallest difference can set everything off balance. A good example would be global warming. You would think that 2 degrees every decade would be a small change, but nothing in ecology is small. Plants need a certain temperature to thrive, if that temperature changes they die. A certain animal may be dependent on that plant for food and when that plant dies so does that animal. Another animal may also be dependent on that other animal for food, and with that animal gone it will also die. It's a viscous cycle that holds lots of power on us humans.
(I hope that helps)
Answer:
Independent variable: Type of fertilizer
Dependent variable: Growth rate of carrots
Control variable: No fertilizer
Explanation:
An independent variable in statistics is defined as the variable that is manipulated, and a dependent variable is defined as the variable that is measured. A control variable is defined as a variable that doesn't change and is used to compare the other variables to. Furthermore, the independent and control variables are graphed on the <em>x</em>-axis, and the dependent variables are graphed on the <em>y</em>-axis.
In this case, the farmers <em>manipulate </em>the <em>type of fertilizer</em> they use to <em>measure </em>the <em>effect it has on growth</em>. The control variable would then be the carrots that grow without any fertilizer, because if the fertilizer does have an effect on growth, you would want to know how much or what kind of effect it has.
