It is the third option. Reason being is because the first one describes what they do when danger approaches and it doesn't say anything about moving. The second one describes what they do to protect their young from the harsh environment around them; no movements mentioned. The fourth one just says what a penguin does but they can be standing when they do it; no mention of any movements at all.
Hope this helps!! :)
The final outputs of the citric acid cycle are ATP, NAD, and CO2
Answer:
After the wastewater is purified it is pumped into the ground to mix with aquifer water. Sometimes the treated water is used to form a barrier against invading seawater on groundwater. The purified water trickles down to replenish the groundwater supply.
Explanation:\
I hope that helps. I don't know if this is right or wrong, but good luck :)
One way a farmer could increase the amount of available nitrogen in his fields without adding synthetic fertilizer would be to grow a legume crop to support the development of root nodules.