Cell division begins when chromosomal DNA replicates and each chromosome becomes a pair of:
a. nuclei
b. sister chromatids
c. mother chromatids
d. eukaryotes
b
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Which of these crops, introduced by the Portuguese, significantly increased the productivity of farming in Africa?
a. Corn and manioc b. Peanuts and papaya c. Sweet potatoes and pineapples d. Cotton
When an entire language community shifts from their native language to their second language so that the native language is no longer being acquired by any children, that language has undergone the process of ____________
Fill in the blank(s) with correct word
Which of the following is true of chorionic villus sampling?
A. it is a method for discovering genetic defects in a mother through the sampling of amniotic fluid B. it consists of a sample composed of placental tissue, which is derived from the embryo C. it involves analyzing a cell that has been removed from an early embryonic state in the laboratory D. it is usually performed between 24 and 28 weeks of gestation
The earliest stone tools discovered thus far, dating to 2.6-2.5 m.y.a.,
A. were made by H. erectus. B. may have been made by Au. garhi. C. were probably made by the last common ancestor of hominins and the African apes. D. belong to the Mousterian toolmaking tradition. E. come from the Djurab Desert in Chad.