For a wind farm to be effective, there needs to be

a. many turbines

b. wind in only one direction

c. low average wind speeds

d. one turbine

The correct answer for the blank is-

A. many turbines .

In a wind farm, wind energy is harnessed in the form of mechanical energy, which is used to produce electricity when turbines rotate ( due to propeller like blades present around a rotor) due to higher speed of wind. The rotor is linked to the main body that rotates, ultimately leading to generation of electricity.

This means that larger the number of turbines, larger is the amount of energy harnessed.

Thus, for a wind farm to be effective, there needs to be many turbines.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.