Endocytosis even though there are two types of this
Answer:
The pressure differences on either side of the valve.
Explanation:
The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.
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The lining of the back of eye containing two types of photoreceptor cells - rods - sensitive to dim light and black and white - and cones - sensitive to colour. A small area called the fovea in the middle of the retina has many more cones than rods.
Photosynthesis is a process when the plants is absorbing sunlight to use the sunlight to make energy for them.
Photosynthesis equation :
6CO2 + 6H2O -> C6H12O6 + 6O2
Carbon dioxide + Water -> Sugar + oxygen
The one with the the limestone thingy is faster because the friction is loss
my educational guess