The "active site" is the portion of the enzyme that binds to the substrate inducing either a anabolic reaction or catabolic reaction. Hope this helps!
According to the colonial hypothesis, choanoflagellates and modern animals have a common ancestry.
This view is supported by molecular data. Choanoflagellates are a group of colonial, unicellular eukaryotes that thrive in free-living settings and are regarded to be the closest living relatives of animals. Choanoflagellates are collared flagellates, and at the base of each flagellum, they have a collar made of interlaced microvilli that resembles a funnel. Both asexual and sexual reproduction are possible in chonoflagellates. One apical flagellum, an ovoid or spherical cell body that is 3–10 m in diameter, and a collar of 30–40 microvilli around it make up their distinctive cell shape.
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Answer:
For the first I can't answer because of I don't know exactly what kind of question is that. But I'mma answer the second one.
2. An earthquake is sudden, rapid shaking of the ground caused by all 50 states, five U.S. territories in the district of Columbia are at some risk for earthquakes. When the accumulated energy grows great enough, the plates break free and emergency supply kits, training, and impleading preparedness plans.
1st of all arteries have a thick walls while veins have have a thin wall
Answer to why arteries have thick walls: arteries have thick walls because blood flows inside them with high pressure and with a high speed