Insects, and some other invertebrates, exchange oxygen and carbon dioxide between their tissues and the air by a system of air-filled tubes called tracheae. Tracheae open to the outside through small holes called spiracles.
<h2><u>Biscuits</u><u> </u><u>can</u><u> </u><u>be</u><u> </u><u>a</u><u> </u><u>nutritious</u><u> </u><u>weaning</u><u> </u><u>food</u><u> </u><u>for</u><u> </u><u>infants</u><u> </u><u>as</u><u> </u><u>many</u><u> </u><u>of</u><u> </u><u>these</u><u> </u><u>are</u><u> </u><u>fortified</u><u> </u><u>with</u><u> </u><u>key</u><u> </u><u>nutritional</u><u> </u><u>vital</u><u> </u><u>for</u><u> </u><u>health</u><u> </u><u>development</u><u> </u><u>such</u><u> </u><u>as</u><u> </u><u>iron</u><u>,</u><u> </u><u>zinc</u><u>,</u><u> </u><u>calcium</u><u>,</u><u> </u><u>Vitamin</u><u> </u><u>A</u><u>,</u><u> </u><u>iodine</u><u> </u><u>and</u><u> </u><u>fluoride</u><u>.</u></h2>
<h2><u>❤</u><u>❤</u><u>itzurprilya</u><u>❤</u><u>❤</u><u>☺</u></h2>
Blood-vascular system and Lymphatic system
sodium chloride contains both positive and negative ions so the bond formed is ionic bond.