The oak tree below is the home where several food chains exist. Birds live in the tree and eat insects they find within the branches. Insects eat parts of the tree like bark and leaves. The transfer of energy moves from the tree to insects and then to the birds. What type of energy provides the oak tree with its energy?

Sunlight' (Solar Light) Energy & water with Carbon Dioxide yield glucose

Explanation:

In the food cycle of trees eaten by insects, & insects eaten by birds -

Sunlight' (Solar Light) Energy & water are used by plants to for the chemical reaction of using carbon dioxide along with formers, to produce glucose (a form of energy) & oxygen.

The correct answer is - The oak tree gets energy from the sun as light energy and stored chemical potential energy.

Explanation:

The oak tree absorbs light energy from sunlight which is light energy that is converted into chemical potential energy stored in chemical bonds in the leaves and fruits of the plant.

The tree uses this stored energy to build leaves and branches and fruits and the organism that eat the leaves or fruits of these plants get this chemical potential energy to convert its energy for their cellular functions.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

a polar bond is formed when electrons are shared unevenly between atoms