Mutualism- symbiosis that is beneficial to both organisms involved
The answer would be pituitary gland.
Completed sentence: Growth hormone is secreted by the pituitary gland while we sleep.
Answer:b) small stangnant pools do not provide enough water
Explanation:
African lungfish is obligate and fresh water habitat organism.
It aestivates between raining season During this peroid it produces UREA which is non toxic and stores iin the body to be excreted into water on the return of wet seasons.
Therefore, if it produces Ammonia, during Aestivation;ammonia is posinious and this kills the lungfish during aestivation of no water and oxygen supply.