It is a because swarm in singular in this case. The whole group acts as one. As a collective noun, swarm can be plural, but only if each bee were doing something individually.
The more effective sentence is, the second one. The slobbering bulldog was hideous is more effective because it has more description.
Answer:
Use a moistened, clean washcloth or cotton ball to wipe each eye, starting at the bridge of the nose then wiping out to the corner of the eye. Wash the rest of the baby's face with a soft, moist washcloth without soap. Clean the outside folds of the ears with a soft washcloth.
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Because, their discussion should be exact
