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marin [14]
2 years ago
7

. A researcher studies the evolutionary relationships between influenza viruses by comparing the genomic sequences of the viruse

s found in pigs, ducks, and humans in a given year. When evaluating the viruses that had infected these hosts the previous year, she identifies a cross-species transfer from humans to pigs. This information supports the hypothesis that cross-species transfer leads to more severe disease if during the previous year _______ suffered a severe influenza pandemic.
Biology
1 answer:
Rainbow [258]2 years ago
8 0

Answer:

pigs

Explanation:

Influenza is an infectious disease caused by influenza viruses, which can be divided into four types A, B, C and D. In humans, influenza A and B viruses are known to cause epidemics, while A viruses are known to cause pandemics. Influenza viruses are also found in birds and mammals (e.g., dogs, cats,  cattle pigs and horses). Cross-species virus transmission refers to the transmission process of infectious viruses between hosts from different species. Several viruses that may cause severe diseases in humans have originated from animal species, e.g., avian influenza A virus that can be transmitted to humans through an intermediate host (e.g., pigs). Other examples of cross-species virus transmission include the Ebola virus and Hantaviruses. It has been suggested that cross-species transmission is a common phenomenon in rapidly evolving viruses.

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Answer:

Option D, Five radish plants are grown in sunlight, while another five radish plants are kept in the dark.

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In a controlled experiment, impact of one independent variable is studied on the dependent variable.  

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The researcher wants to study the effect of sunlight on radish plants when they are exposed to it   and compare it to the effect created on radish plants  that are kept in dark.  

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