There is still some controversy among biologists about whether Neanderthals should be placed within the same species as modern humans or into a separate species of their own. Most DNA sequence data analyzed so far indicate that there was probably little or no gene flow between Neanderthals and Homo sapiens. Which species concept is most applicable in this example?
A) phylogenetic
B) ecological
C) morphological
D) biological
D
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A differential interference contrast microscope uses dyes to give colored, three-dimensional images.
Answer the following statement true (T) or false (F)
What connective tissue component is unique to cartilage?
a. matrix hardened by calcium and phosphorus b. extracellular matrix c. fibroblasts d. elastin e. rubbery, compression-resistant glycoproteins
Parenchyma, collenchyma, and sclerenchyma are classified as tissues in the:a
dermal tissue system. b. vascular tissue system. c. ground tissue system. d. primary tissue system. e. secondary tissue system.
The main function of the large intestine is to
A. supply enzymes for digestion. B. remove water. C. absorb nutrients. D. produce vitamins.