Which step caused an aerobic atmosphere during the history of earth?
a. origin of cell membranes
b. an energetic atmosphere
c. origin of anaerobic prokaryotes
d. origin of photosynthetic prokaryotes

Aperson travels 35 km in 0.4hrs, followed by 53 km in 0.6 hr. what is the average speed

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.