Which statement best describes an effect of the low density of frozen water in a lake? a. when water freezes, it contracts, decreasing the water level in a lake. b. water in a lake freezes from the bottom up, killing most aquatic organisms. c. when water in a lake freezes, it floats, providing insulation for organisms below. d. water moves thermal energy from the land around a lake, causing the lake to freeze.

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave