According to the following figure, which extant group of Homo sapien potentially has DNA from all three of the pictured extinct hominin lineages, and which has none?

A. east asians, africans
B. africans, europeans
C. east asians, europeans
D. melanesians, africans


Answer: D. melanesians, africans

Biology & Microbiology

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Biology & Microbiology

Some friends are trying to make wine in their basement. They've added yeast to a sweet grape juice mixture and have allowed the yeast to grow

After several days, they find that sugar levels in the grape juice have dropped, but there's no alcohol in the mixture. The most likely explanation is that ________. A) the mixture needs more sugar; yeast need a lot of energy before they can begin to produce alcohol B) the mixture needs less oxygen; yeast only produce alcohol in the absence of oxygen C) the mixture needs more oxygen; yeast need oxygen to break down sugar to produce alcohol D) the mixture needs less sugar; high sugar concentrations stimulate cellular respiration, and alcohol is not a by-product of cellular respiration

Biology & Microbiology

Biological species consist of groups of ________

A) populations B) domains C) families D) genera

Biology & Microbiology

The placental mammalian counterpart of Australia’s

spiny anteater is (are) the a. Tasmanian devil. b. aardvark. c. giant anteater. d. woolly lemur. e. aardvark and giant anteater.

Biology & Microbiology