The most important primary producers in marine ecosystems are               .

Video transcript

Hi everyone. Let's look at our next problem. It says blank. Are the first major producers in blank ecosystems. And let's recall that the first major producers are those organisms at the bottom of the food chain. Mhm. And they are the ones that synthesize food molecules um from energy from the sunlight or other sources and their that source of energy for everything higher than them in the food chain. Again, the most common is photosynthesis though you've got a few organisms that harvest some chemical energy, those bacteria in the deep ocean, that sort of thing. But in general that's going to be photo synthesizers. So let's look at our answer choices to see which are paired correctly. We have choice A diatoms. The first major producers in marine ecosystems and this is correct. Most photosynthesis in marine ecosystems is carried out by diatoms. So they are the first major producers in marine ecosystems. But let's just look on at our other furniture choices. Choice B says green algae are the first major producers in terrestrial ecosystems. Well, this is not correct. Green algae are not the source of the major producers and terrestrial ecosystems. That would be plants carrying out most of the photosynthesis and terrestrial ecosystems. So Choice B is not correct. Choice C. Has dina fragile, it's in freshwater ecosystems. Well, this is not correct choices not our answer. Dina flag bullets are the second major producers in marine ecosystems and finally, choice D says plants. First major producers in marine ecosystems. Well this is not correct. There are some plants and marine ecosystems, the sea grasses but that's a very small percent. As we said above. Diatoms are the major producers of photosynthesis in marine ecosystems. So again, our correct answer is choice. A diatoms are the first major producers in marine ecosystems. See you in the next video.