Answer:

The extract describes the process of a tree gradually deteriorating and eventually dying. It mentions the "scorching and choking in sun and air" which suggests that the extreme heat and lack of moisture are contributing factors to the tree's demise. The tree is also described as "browning, hardening, twisting, withering," which further indicates that it is suffering from the harsh conditions. Finally, the extract states that "it is done," implying that the tree has reached its end.

Factors that killed the tree:
The extract suggests that the main factors that killed the tree are scorching and choking in the sun and air. This can be further explained as follows:

1. Scorching heat: The intense heat from the sun can cause excessive evaporation of water from the tree's leaves and soil, leading to dehydration and stress. This can eventually result in the tree's death if it is not able to access enough water to sustain its vital processes.

2. Lack of moisture: The choking mentioned in the extract could refer to a lack of moisture in the air or the soil. Trees require a sufficient amount of water to survive and thrive. Without enough moisture, the tree's roots are unable to absorb water and nutrients, leading to a decline in health and eventual death.

3. Insufficient resources: The extract also mentions browning, hardening, twisting, and withering of the tree. These symptoms indicate that the tree is not receiving enough resources, such as sunlight, nutrients, and water, to support its growth and survival. Over time, this lack of resources weakens the tree and makes it more susceptible to disease and other stressors.

4. Cumulative effect: It is important to note that the tree's death is likely not due to a single factor but rather a combination of multiple stressors. The scorching heat, lack of moisture, and insufficient resources all contribute to the tree's decline and eventual demise.

In conclusion, the tree in the extract is killed by a combination of scorching heat, lack of moisture, and insufficient resources. These factors gradually weaken the tree, leading to its browning, hardening, twisting, and withering, until it is ultimately unable to survive.