Answer:
an elastic wave in the earth produced by an earthquake or other means.
Explanation:
earthquake, surface
primary wave
;)
The sewing needle should float in the water if placed on a horizontal angle if I remember properly.
I hope this helps in some way.
Answer:
"Lipids are an essential component of the cell membrane. The structure is typically made of a glycerol backbone, 2 fatty acid tails (hydrophobic), and a phosphate group (hydrophilic)."