Answer:
A barter system is an old method of exchange. Th is system has been used for centuries and long before money was invented. People exchanged services and goods for other services and goods in return.
Explanation:
Answer:
B. dark brown sea lions blend in with the color of rocks and escape predators
Explanation:
The lighter sea lion population is going down while the darker sea lion population is going up. This means that dark brown sea lions have some kind of natural advantage over light brown sea lions.
Answer:
See blow
Explanation:
a and b) Metformine inhibits the enzime glycerol-3-phosphate dehydrogenase. This enzime catalyzes the conversion of glycerol phosphate to dihidrocetone phosphate. This decreases the concentration of NAD on the cytosol, and the realation NADH/NAD increases in this comparment, and decreases on the mitochondria, which restricts the conversion of lactate to pyruvate, preventing the use of the substracts to the gluconeogenesis.
