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I believe the answer is B.2
The physical characteristics that determine the exhistance of organisms in aquatic enrironments relate to its pH (which is whether it's acid, neutral or basic), the water clearance (which refers to the particles diluted in it, the presence of toxic substances, etc), the presence of predators (bio chain) and also if there's enough food for the organisms to live, to reproduce and if the water temperature allows them to subsist or if they need to migrate within a year, due to the natural changes.
Plants adapt in different ways depending on if they are submerged or floating. Floating plants feature a waxy upper surface, which helps to repel water. The upper surface also contains the chlorophyll needed for photosynthesis. Submerged plants employ a different water circulation system; instead of running water though stems, they absorb water and nutrients from the surrounding habitat. The roots of a submerged plant are primarily for anchorage and not for sourcing nutrients. This prevents them from being swept away by the currents.
The marine biome is the largest in the world, covering close to 70 percent of the earth's surface. It is also home to the most diverse collection of life: scientists have discovered over a million plant species living in this biome and estimate that there are still nine times this amount yet undiscovered. Many of the plants in this habitat rely on photosynthesis for nutrition. Algae is a particularly important plant, as it is responsible for the production of nearly half the oxygen on the planet.
Answer:
The green revolution was awsome to achieve global food security in the 1960, but it also conveyed two important problems: first, the use of big amounts of chemical fertilizers that contaminate our soil and water resources, and second, a decrease in the genetic variability of the crops. These two concerns were even worse for developing countries
