To test how fertilizer affects tomato plants , a farmer divided a field of young tomato plants into 10 plots of equal size. the farmer then put fertilizer on half of the plots and no fertilizer on the other half of the plots. the control group in this experiment was :

Control Group - tomato crop on which no fertilizer is applied

Explanation:

The control group in this experiment is the tomato crop on which no fertilizer is applied.

A control group in an experiment is the group on which the testing/treatment with in an experiment is not applied in order to compare it with the group that receives the testing/treatment.

Hence, tomato crop (which do not receive fertilizer) are the ones whose production will be compared with the tomato crops that receive fertilizers.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.  

allowed for the prediction of the properties of missing elements.