Which ponds contained only killifish as predators?
a. primero and quinto
b. segundo, tercero, and sexto
c. tercero and quinto
d. quarto, sexto, and septimo
e. none of the above (all ponds containing killifish also contained cichlids)
a
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Which tissue will conduct sugars and organic molecules throughout the plant?
a. Phloem b. Dermal c. Xylem d. Collenchymas e. Sclerenchyma
Speciation is more likely to happen when there is significant gene flow between populations.
a. true b. false
Homologous chromosomes contain the same ____ but may contain different ____.
a)alleles, genes b)sister chromatids, genes c)alleles, sister chromatids d)genes, sister chromatids e)genes, alleles
How long ago did Australopithecus afarensis live?
A) 50,000—100,000 years ago B) about 2.2 million years ago C) 500,000 years ago D) about 3.2 million years ago