The heart has four valves that control the flow of blood. Two of the valves (the AV valves) normally prevent blood fromflowing upwards. The other two valves (semilunar valves) normally prevent blood from flowing downwards. The AV valvesand semilunar valves have different shapes. Which principle of anatomy and physiology does this example represent?
1. Organ systems are interconnected.
2. Organ systems contribute to homeostasis.
3. There is a hierarchy of anatomical organization in an organism.
4. Structure is linked to function.

there is no stairs in bungalow

explanation:

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

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