According to the article, “Both groups [the United Nations and the IIASA] foresee India becoming the world’s most populous country, with its numbers peaking around 2070 and declining to around 1.5 or 1.6 billion by 2100. Where they differ most is in their estimates of the coming population decline in China and of the coming population explosion in Africa south of the Sahara—where most of the world’s growth is going to occur.” Why do the groups, the United Nations and the IIASA, differ on their projections for the growth of the world’s population, and how much uncertainty exists?

Astudent who takes a multiple-choice test by reading the stem of each item, generating the correct response before looking at the choices, and then chooses the response closes to the answer is using a.a heuristic b.an algorithm c.vicarious problem-solving d.means-end analysis

Rewrite the following sentences in active voice. caution: one sentence (only one) is written in active voice. do not rewrite it just label it as being active. 1). the use of copernicus's theory was forbidden by religious leaders until 1757. 2). i am puzzled by your question. 3). the girl is frightened by horror movies; she only watches chick-flicks. 4). radium and polonium were discovered by marie curie. 5. most of the town was destroyed by a tornado. 6). these flowers were planted by the 4-h club. 7). the little boy showed his mother the bruises, cuts. and bumps on his shin. 8). pluto was discovered by clyde william tombaugh in 1930 in flagstaff, arizona. 9). the painting was purchased by mr. jones. 10). the song was performed many times by kate smith. 11). england was ruled by a woman nicknamed "bloody mary" from 1553-1558. 12). the law of universal gravitation was discovered by sir isaac newton.

What is tge speed of sound in dry air at 0°c