Fill in the blank: This subject is on Lipids.

fatty acids: fats that humans must eat because the body can’t make them.

Polyunsaturated fatty acids: fats that humans must eat because the body can’t make them.

Hope this helped! :)

Explanation:

the answer is d. chordata

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