The formation of new species from populations that are not isolated from each other is called
a. convergent evolution.
b. gene flow.
c. allopatric speciation.
d. sympatric speciation.
e. parapatric speciation.
D
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Transmission of infectious agents from host to host with the involvement of an intermediate inanimate material is considered to be _____transmission
Fill in the blank(s) with the appropriate word(s).
What is the role of tight junctions in the transport of glucose across the intestinal epithelium?
a. They open and allow glucose to pass between the epithelial cells. b. They keep the Na+-K+ pumps in the apical membrane only. c. They keep the Na+-glucose cotransporter in the apical membrane and the glucose-facilitated transporter in the basolateral membrane. d. They keep the glucose-facilitated transporter in the apical membrane and the Na+-glucose cotransporter in the basolateral membrane.
Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia). Using radiometric dating, scientists can show that these people were alive as
recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools? What will be an ideal response?
Cilia are found in certain
A) Protozoa B) Fungi C) Algae D) Bacteria E) All of the above