How is a species defined?
O
A. By the allele frequency in the population
O
B. By the number of common ancestors
O
C. By the fixed alleles in the species
O
D. By the total number of chromosomes

Why was mendel's work not accepted at the time? o a. his results were false. o b. he did not repeat his experiments. o c. he did not have any data. o d. his results were surprising,

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.