Combine the two sentences into one using a subordinating clause:

I am going to the store. I need to buy eggs.
I am going to the store because I need to buy eggs.
Complete the following task based on the instruction and optional input provided.### Instruction:
Combine the two sentences into one using a subordinating clause:

I am going to the store. I need to buy eggs.

### Output:
I am going to the store because I need to buy eggs.