What is represented by this BrainBat?

KCAB KCAB

Can you complete the grid without forming a 3-In-A-Row of the same colour.

Each row and column has an equal number of Blue and White squares.

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What are you given at a very early age and always belongs to you, but is used more by others than by yourself?

I'm amazing 'cause I've got the force
To hold down a cow or a horse
As you've doubtlessly found,
I am always around,
And I'm constantly working, of course.

What am I?

Each of these sets of arrows represents a word - what are the words?