Do you think perception has a greater impact on the rate of chemical weathering or mechanical weathering explain

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

What is the compliment dna strand to the following sequence: ttgactaggcta

If you relate the doppler effect on sound to the color of light waves, a police car would be the color as it approaches and the color as it recedes away from the observer.