They both have 3 coelom usually develop larval forms known as trochophores<span />
<span>sponges have flagellated cells called Choanocytes that line their internal chambers and create water flow to capture food.
One of the main function of choanocyte is to generate a flow of water through the sponges for to be used during its repiratory and digestive process</span>
The lock and key model is where the substrate has a specific shape which can fit into the specific shape of the active site of the enzyme, just like how a key has a specific shape which can fit into a specific lock.
In other words, the substrate is complementary (same shape) to a specific enzyme, so the substrate can bind/fit to the enzyme.
(left-to-right)
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photosynthesis (by the patch of grass)
animal respiration (on top of the bull)
respiration (on top of the tree)
burning of fossil fuels (on top of the factory)
natural combustion (by the small fire)
