Mercury, due to it's low gravity it would not be able to hold a very strong atmosphere.
The free nerve endings
can detect pain, temperature, itch and hair movement. Merkel's disks can detect pressure, position and static touch features. Pacinian corpuscles are sensitive to vibration while Meissner's corpuscles are sensitive to light and touch.
Phytoplankton and Photosynthesis
Importance in Global Ecosystem
