The cell structure at the arrow in the picture below is present in these cells which line the airways, but are NOT present in bacteria. What is the cell structure at the arrow?

The cell membrane

Explanation:

The arrow is pointing to the outside ¨shell¨ so to speak which is the cell membrane, bacteria do not have cell membranes

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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