Oxygen enters the ocean only at the surface, from and a. photosynthesis, the atmosphere b. volcanic eruptions, meteorites c. photosynthesis, respiration d. respiration, photosynthesis e. respiration, rainfall

Oxygen enters the ocean from photosynthesis and the atmosphere.

The atmosphere contains oxygen molecules that when those molecules enter in contact with the ocean water, they get dissolved in the water.
The other way is through photosynthesis. Just like in the land, there are photosynthetically active plants and bacteria in the ocean, that converts carbon dioxide and water, and releases oxygen.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.