What is the pH of a solution with a H+ ion concentration of 1 x 10^-4

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Crossing over is a method of (blank)?

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.