The correct answer is - A. A few centimeters a year.
Earth's crustal plates move very slowly, between 2 cm and 5 cm (depending on the plate) annually. This is the reason why it takes millions of years for them to significantly change their position, and with it the appearance of our planet. These crustal plates are slowly moving around the planet because they are powered by flow in the interior mantle.
Answer:
One fertilizes the egg, and the other combines with the two polar nuclei.
Explanation:
Adjacent cells can signal others by direct contact, while nearby cells that are not touching can communicate by the release paracrine signals.
Hope this helps,
Davinia.
