The phase contrast microscope uses out-of-phase and in-phase light rays that produce contrast areas allowing scientists to detect even a minute number of protein molecules and focus on the minute internal structures of a particle.
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Answer:
Once you begin swallowing, the process becomes automatic. Your brain signals the muscles of the esophagus and peristalsis begins. Lower esophageal sphincter. When food reaches the end of your esophagus, a ringlike muscle—called the lower esophageal sphincter —relaxes and lets food pass into your stomach.
Well what I know of it’s coal
When the soil is dry, it wouldn't be easy to make a footprint so the soil must be moist. Later, the print would harden and that preserves the footprint.
Overall: soil is moist.
