The correct answer here is C. Water molecules are more free to move, so they will be able to engage in rapid and fluid contact with magma. This is in contrast to fixed continental rock, which may have quick initial heat transfer but which tapers off quickly because the rock is not flexible enough to send cooler rock towards the magma.
S phase is the DNA synthesis phase. During this portion of the cell cycle, the cell replicates its entire complement of DNA. It also forms the centrosome, which is the microtubule-organizing center that will eventually help the cell pull apart the DNA that will be divided between daughter cells.
Recycling that reduces toxic wastes and environmental pollution obviously provides immediate benefits to human health. By reducing wastes, recycling also conserves natural resources, protects natural ecosystems, and encourages biological diversity, all of which enhance the long run sustainability of the biosphere.
C...the key is that they are photosynthetic...so they produce oxygen (like plants)!
