Primitive bryophytes like mosses and liverworts are so small that they can rely on diffusion to move water in and out of the plant. Mosses have a few strands of water conducting tissue in their central stem, but nothing like the large and well organized network of tubes in tracheophytes, or tube plants.s we pass from mosses to ferns, we see a gradual transition from primitive to modern traits. There are two major trends you should focus on in today's lab. The first is a transition in life cycles, the second is a change in basic internal structure.
Consider a parcel of 0.30 to 0.39 carat diamonds that average F to G color and VVS1 to VVS2 clarity. Given the FVVS1 price of 36 ($3,600 per carat) and the G-VVS2 price of 29 ($2,900 per carat), the average price is calculated at 32.5 or $3,250 per carat. This approach works well based on the general principle that the Price List should be used as an indicator of value and not as a final price.
DIAMOND. $15,000/carat. While diamonds are quite common compared to most of the gemstones listed here, they are still one of the most expensive. The reason, of course, is the enormous popularity of diamonds.