Hypotheses must be provable. If scientists cannot prove a "hypothesis" right or wrong, they need to change it to a legitimate hypothesis - something you can prove.
If it is proven wrong, they can change certain aspects of it to make a more specific experiment.
The first option for 1 and the second option for 2
loblolly pine trees
Explanation:
Population density refers to the amount of organisms living in a particular area:
Population density = 
Area of the forest = 10acres
Population densities of:
White-tailed deer = 
= 0.8white tailed deer/acres
Coyotes =
= 0.7coyotes/acres
Armadillos =
= 4.5armadillos/acres
loblolly pine =
= 23.1loblolly pine trees/acre
The population with the highest density is that of the loblolly pine trees with 23.1 of the trees in an acre.
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