I love Grammar
The sun and the moon (affect/affects) Earth's tides.
affect
Bread and butter (is/are) my favorite breakfast combination.
is
One-third of Earth's surface (is/are) covered by water.
is
Genetics (studies/study) how traits are inherited from parents to offspring.
studies
Sound or light (travels/travel) in waves through different mediums.
travels
The rise and fall of tides (is/are) influenced by the moon’s gravity.
is
Cells and tissues (works/work) together to form organs in living organisms.
work
Oxygen or carbon dioxide (plays/play) a crucial role in respiration.
plays
A team of scientists studies the (effects/effect) of climate change on marine life.
effects
A flock of birds (migrates/migrate) to warmer regions during winter.
migrates