Answer: A
Explanation: Ripple marks are sedimentary structures and indicate agitation by water (current or waves) or wind.
Answer:
A few of the positive particles aimed at a gold foil.
Answer:
Cyanobacteria were photosynthetic and slowly changed the earth's atmosphere from CO2 rich to O2 rich. Photosynthetic cyanobacteria evolved by 3.5 billion years ago and greatly modified earth's atmosphere.
No I am not in PBS (principles of biomedical sciences)
Answer:
B or C I hope this is helpful
