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>Lactose, a sugar present in milk, is one of simple sugars used in food preparations for infants.
The word "sugar" is a noncount noun; therefore, "a" should be deleted.
>The brightly colored kingfisher that perches until it sights a fish, then dives into the water to catch its prey
There has to be a verb in the sentence above. The phrase "that perches" should be "perches" in order to make it a complete sentence.
> Copper was the first metal used by humans and is second only to iron into its utility through the ages
"Into" should be "in" here.
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>Independence hall in Philadelphia is (where) the declaration of independence （also）the United states constitution （were signed）.
"Also" should be "and" because both "the declaration..." and "the United States" are subjects of the verb phrase "were signed."
>Virtually the same array of mammals --- in the hills surrounding LA today occupied this area in the late stone age.
You are right. The sentence requires the relative pronoun "that lives."
>The peccary, am American mammal, is (closely related) to (the) swine family (and) fills (an ecological similar) rate
The word "similar" is an adjective; therefore, "ecological" has to be the adverb form "ecologically" in order to modify the adjective "similar."
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