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Last updated: March 6, 2025

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Hint	Answer
an opening on the body surface that allow air to enter an insects tracheal system	spiracles
where are spiracles located	exoskeleton
how do insects regulate water loss through the spiracles	open and close
what are air filled tubes branching throughout the insects body	tracheae
what do tracheae do	deliver oxygen and remove carbon dioxide from cells
what lines the tracheae to prevent it from collapsing	chitin
what are tracheoles	smallest tracheal branches which penetrate insect tissues
how does air flow the insect tracheal system	spiracles, tracheae,tracheoles
what are the organs of gas exchange in bony fish	gills
where are the gills located in bony fish	operculum
what is countercurrent flow	blood and water flow over the gills in opposite direction
how do plants obtain oxygen for aerobic respiration	from the atmosphere through the stomata

Hint	Answer
what are stomata	pores that open and close
where is stomata located	lower epidermis
what adaptations do plant leaves have to reduce water loss	waxy cuticle, guard cells
what are plants adapted to survive in dry conditions	xerophytes
which part of the plant reduces water loss	upper epidermis
what's the function of mesophyll	photosynthesis
which tissue has stomata surrounded by guard cells	lower epidermis
what does the vascular tissue do (phloem and xylem)	transports water and nutrients
out of inspiration and expiration, which one is an active process	inspiration
what is ventilation	constant movement of air in and out the lungs
which main muscles are involved in ventilation	diaphragm, internal intercostal muscles, external intercostal muscles

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