Designing efficacious norovirus vaccines remains a major challenge due to several factors:
(1) the extreme genetic variability within the norovirus family and within genogroups
(2) the rapid evolution of antigenically dissimilar pandemic GII.4 norovirus strains
(3) the lack of lasting immunity upon natural exposure to noroviruses in at least a proportion of the population.
4. All of the above.
5. Some plant-like protests undergo sexual reproduction.
6. Animal-like protists with a flagellum.
7. True.
To clarify, you should read the directions that come with the lab activity to be sure of what to do in the lab.
Because if the new species is better at doing whatever the original species does, the original species can die because they are outcompeted by the new species, and because the new species is better, they can cause a further decline of for example the food supply that they're outcompeting the original species for. This can cause problems in the entire food web/ecosystem
Answer:
A
Explanation:
The others don't make sense, and are the opposite of what would happen if human population increased.
