Under natural conditions, which of the following may cause allele frequencies to change? a. limited resources, which could cause one allele to have an advantage b. a random assortment of alleles during sexual reproduction c. no emigration from the population d. no immigration into the population

The answer is A. Limited resources will result in stiff competition among individuals in the population. This will result in differential survival across the population because only the individuals that are able to outcompete the others will be able to reproduce and pass their genes to the next generation. This, therefore, will change the allelic frequency of the population.

The continents began to drift apart by the end of the Permian period.

Explanation:

The Permian is a geologic term and method which traverses 47 million years from the completion of the Carboniferous Time 298.9 million years before (Mya), to the start of the Triassic time 251.902 Mya. It is the ultimate period of the Paleozoic age; the subsequent Triassic period relates to the Mesozoic era. The theory of the Permian was inaugurated in 1841 by geologist Sir Roderick Murchison, who described it later the municipality of Perm.