A plant that lacks true roots, stems, and leaves will be a(n) _______.
a) gymnosperm
b) angiosperm
c) nonvascular plant
d) seedless vascular plant
Ans: c) nonvascular plant
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Consider the phylogenetic tree shown above. Geographic labels indicate the origin of humans sampled for mtDNA sequence analysis. Chimp is the outgroup. Which of the following statements is correct?
A. The tree supports the "out of Africa hypothesis" for the origin humans because it implies that the common ancestor of all the humans is of African origin. B. The tree does not reveal anything about the geographic original of humans. C. The tree supports the multi-regional hypothesis because there are four independent populations. D. The closest relative to the Kenyans are the English. E. The Chinese share a more recent common ancestor with the Ethiopians than the Kenyans.
Where is most the Earth’s phosphate found?
a. ocean water b. aquifers c. the atmosphere d. rocks and sediments e. plants
Exchange of respiratory gases through the skin is a
characteristic of many a. fishes. b. amphibians. c. reptiles. d. mammals. e. birds.
Differentiate between genotype, phenotype, and allele frequencies. What will be an ideal response?