The oceans affect the biosphere by (A)absorbing a substantial amount of the biosphere's oxygen. (B)regulating the pH of freshwater biomes and terrestrial groundwater. (C)decreasing winter temperatures of coastal terrestrial biomes. (D)removing carbon dioxide from the atmosphere.

Video transcript

Welcome back. Let's look at the next question. Which of the following is not one of the ocean's functions affecting the biosphere. Let's keep in mind that we have sort of two parts here. It has to be. We're talking about a function of the ocean and also something that affects the biosphere. Also paying attention to this. Not here, meaning we need to look at something that is not doing those two things. So let's look at our first choice A oxygen production. Well, oxygen production is a function of the ocean. All the Plankton in the ocean that performs photosynthesis um produces oxygen as a result of the photosynthesis. In fact, it produces 50-80% of the world's oxygen. So that is a function of the ocean. And with that quantity of oxygen production, it definitely affects the biosphere. So It does part one and it does part two. Since we're looking for something that does not fit those two things. We eliminate choice a choice B says carbon dioxide removal. Well, this is the flip side of oxygen production. We have a lot of photosynthesis going on in that plankton uh definitely a function of the ocean. And each round of photosynthesis is consuming carbon dioxide and that removal of significant amounts of carbon dioxide definitely affecting the biosphere. So eliminate Choice B. Now, let's take a choice C Choice C is climate regulation. This is an ocean function. Um The water currents carry warm water and precipitation away from the hot equator towards the cold poles and then carry cold water back from the cold um cold pole regions polar regions down to the warmer regions. So this helps to sort of even out the uneven distribution of all that solar radiation. So definitely a function of the ocean and of course as regulating the climate definitely affects the biosphere. So since it does, has those two um qualities choice see also not our answer. So we're just left with Choice D. And this says provision of habitat for marine animals. Well, this is one of the ocean's functions as a habitat for all those marine animals. However, that doesn't really affect the biosphere. So Choice D. Is going to be our answer because it only fulfills one of the parts of our problem here. So Choice, the provision of habitat for marine animals is our answer. See you in the next video.