The cotyledons move downwards during the early part of the night in only 6 of the genera; and in one of them, Cannabis, the curving down of the tip is probably due to epinasty, as Kraus believes to be the case with the leaves.
The upward movement of the cotyledon during the afternoon and early part of the night is here plainly shown.
The first or early part of the day, variously understood as the earliest hours of light, the time near sunrise; the time from midnight to noon, from rising to noon, etc.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "early part" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.