_______ porpoises and dolphins, whales are mammals.
A. As
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A baby might show fear of an unfamiliar adult, _______ he is likely t smile and reach our to another infant.
The United States spends more money on advertising_______ country in the world.
_______plants, which manufacture their own food, animals obtain nourishment by acquiring and digesting their food.
A microscope can reveal vastly_______ detail than is visible to the naked eye.
The deep oceans contain some of the_______ of all living creatures.
Apart from Pluto, the outer planets_______ the inner planets and are made mainly of lighter materials such as
hydrogen and helium.
For many children, nothing seems so exciting_______ their first airplane ride.