By the first birthday, an infant typically his or her birth weight.
a. doubles
b. triples
c. quadruples
d. maintains

The correct answer is an infant typically b. triples his or her birth weight.

With a regular diet, following the The American Academy of Pediatrics recommendation, that infants be  exclusively breastfed for the first six months of life. After introducing solid foods, babies should continue to breastfeed for a  year, or as long as is mutually desirable by the mother and baby. The regular weight expectation is for the baby to triple his or her birth weight by about age 1 year, and also grow about 1 centimeter per month.

for me i cant do homework without music, so, i guess i would say faster with it, than without it. for me at least.

active voice: my father cut the tree.

passive voice: the tree was cut by my father.

active voice: people buy newspapers every day.

passive voice: newspapers are bought (by people) every day.

active voice: people have been using movies as political propaganda since world war ii.

passive voice: movies have been used as political propaganda since world war ii.

active voice: donna gave me my birthday present.

passive voice: i was given my birthday present (by donna). / my birthday present was given to me (by donna).

active voice: mom will leave the keys on the counter.

passive voice: the keys will be left (by mom) on the counter.

the words in parentheses are the agent of the passive voice and can be omitted when obvious, generic, or simply unnecessary.