False,<span>The exchange of oxygen and carbon dioxide between the air and the bloodstream occurs in the</span>alveoli of the lungs.
<span>DNA, cell membrane, ribosomes, and membrane-bound</span>
Ans.
Cell-to-cell communication allows signalling of essential substances between the plant cells, which are surrounded by cell walls. The molecules used by plants for long-distance signalling are known as hormones, such as auxin, ethylene, and gibberelin.
These hormones are secreted by one plant cell and received by another plant cell, where it exerts it affect. Thus, the correct answer to be fill in the blank is 'option A). hormones.'
93AU from the surface of the sun, or the third planet out from the surface of the sun.
