The amphibians are believed to have arisen from ancestral:a
chondrichthyean fish.
b. actinopterygian fish.
c. reptiles.
d. dipnoi.
e. actinistia.
D
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Select the statement that is correct regarding Chagas disease.
A. It is caused by a fungal pathogen. B. Late-stage disease is characterized by autoimmune reactions in the host. C. An effective vaccine is available for prevention in endemic areas. D. It is transmitted by respiratory droplets.
Pain receptors are activated by tissue damage, but pain perception requires intact, functional neurons. How does this work?
A. Nociceptor neurons have special membrane repair mechanisms. B. The nociceptor neuron only sends action potentials as it is dying. C. The axon continues to fire action potentials despite damage to the cell body. D. The neuron itself does not need to be damaged; it responds to signals released by nearby damaged cells. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about pain receptors? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
________ is a disease of the respiratory tract caused by the bacterium Mycobacterium tuberculosis.
Fill in the blank(s) with the appropriate word(s).
If it were found that all animals except the Parazoa had a particular set of genes, one could conclude
A. that those genes probably are related to the embryonic formation of tissues. B. that Darwin was incorrect in his idea about descent with modification. C. that those genes are not useful in interpreting phylogeny. D. that those genes are related to cell wall formation. E. that the Parazoa are not animals.