Biology, 11.02.2020 06:11, snowww5492
Cyanobacteria changed the atmosphere on early Earth because they led to increased a. reduced, soluble forms of iron. b. nitrogen levels. c. water levels in the oceans. d. atmospheric O2 levels.
Answers: 2
Biology, 22.06.2019 11:30, yarrito20011307
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.
Answers: 1
Cyanobacteria changed the atmosphere on early Earth because they led to increased a. reduced, solubl...
English, 22.04.2020 22:34
English, 22.04.2020 22:34
Biology, 22.04.2020 22:34
English, 22.04.2020 22:34
Mathematics, 22.04.2020 22:34