Answer and Explanation:
Hypothesis: Half of the trees could not survive because the yard is exposed to extreme environmental conditions to which the plants were not able to adapt.
A hypothesis is a scientific conjecture, not verified, that requires corroboration. It is a possibility, but not a fact.
A hypothesis must express what is expected to occur in a perfectly comprehensive manner. There must be a logical relation between variables. It must be objective.
There are different kinds of hypotheses: descriptive, correlative, differentiative, or causative.
The hypothesis example proposed for the trees´ survival situation, belongs to a causative hypothesis, where cause and effect relations between variables are proposed. In this case, as the environmental conditions in the yard were too extreme, half of the trees could not survive.