The advantage for the reduced gametophytes in seed plant is that they gain nutrients from the sporophytes
Gametophytes are microscopic and have capacity to develop from spores retained in the sporangia of parental sporophyte. This kind of arrangement protect developing gametophyte from environment stress which enable it to gain nutrient from sporophyte.
Endothermy is the proper term for this. I got a 100% on the test.
Answer:
In general, life needs to maintain a pH level between 05-8 ( second choice)