A25-year-old athlete reports a sudden popping sound in the knee. this results in difficulty with weight bearing and acute swelling of the knee. this assessment data supports damage to which anatomic structure?

Which event would lead to primary succession of a forest?

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

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.