In a tight race, the presence of additional candidates could well affect the outcome.

The presence of specific minerals can also affect soil color.

The presence of Randall will affect all their lives in unexpected ways.

"They have confirmed that their presence will not affect the star."

How does the presence of cameras affect the people you film?

I can't tell you how their presence affected me.

Now, suddenly, the presence of the bats was affecting everybody's life.

Our presence hadn't affected their development up to then; we were zilch.

How their presence in the cities and suburbs will affect our wildlife remains to be seen.

The presence of hills in the center has affected the drainage pattern.