The super continent _____ included the landmasses that are currently found in the southern hemisphere
a. Antarctica
b. Pangea
c. Eurasia
d. Caprica
e. Gondwana
ANSWER: e
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Identical population splitting events occurred simultaneously on two neighboring islands, B and C, producing subpopulations B1 and B2, and C1 and C2. We do the same sampling scheme to analyze B1 and B2, and C1 and C2
We find that B1 and B2 are reproductively isolated from each other after 50,000 years, and that C1 and C2 are still interfertile after 100,000 years. Why does reproductive isolation arrive at different rates on these three islands? What will be an ideal response?
What is the major difference between ionic and covalent bonds?
a. Ionic bonds are reversible; covalent bonds are not. b. Ionic bonds only occur between non-metallic elements. c. In ionic bonds one or more electrons are transferred between atoms, whereas atoms in covalent bonds share electrons. d. Covalent bonds only occur in the presence of radioisotopes.
Which of the following choices places the layers of human skin in the correct order from shallowest to deepest?
a. dermis, epidermis, hypodermis b. hypodermis, dermis, epidermis c. hypodermis, epidermis, dermis d. epidermis, dermis, hypodermis
A motor neuron and the muscle cells it synapses with form a(n)
a. active site. b. action potential. c. motor unit. d. cross bridge. e. motor network.