The vaccine was made in the past year, and the flu virus has mutated and grown resistant to this year's flu vaccine
The correct answer is D. Precambrian Time - Paleozoic Era - Mesozoic Era - Cenozoic Era. This is the correct order of the geologic time scale, from oldest to most recent. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
Answer: The correct answer is-
Allopatric- option 2.
Sympatric - option 1.
Allopatric and sympatric are primarily the two major mechanisms for speciation ( formation of new species from an ancestral species).
In allopatric speciation, a population splits into two different species when it is isolated by physical or geographical barrier.
On the other hand, sympatric speciation occurs wihtin the same area. A population splits into two species that is becomes reproductively isolated when a change in the chromosome number occurs.
Thus, option first corresponds to sympatric whereas option second shows allopatric speciaton.
