Answer:
a) i. low, ii. high, iii. low
Explanation:
Answer is D. Their tunnels act as conduits for rain water to seep into the ground, thereby promoting the growth of grass.
Prairie dogs are the rodents which make burrows. These prairie dogs live that burrows in large colonies in the grasslands. Prairie dogs are regarded as a “keystone” species because their habitats provide benefits to lot of other species. A number of species such as tiger salamander use their burrows as their homes. Most importantly prairie dogs aerate and fertilize the soil as their burrows act as conduits for rain water to seep into the ground, thereby promoting the growth of grass. This promote greater diversity of plants in that region.
Think of it like this. Horses do a LOT of galloping, which is hard on the feet! Hooves are a physical ADAPTATION, so that the horses won't experience pain on their journeys. They're hard, so that the horses don't feel the ground nearly as much. Now, mountain goats travel over rough terrain, with sharp rocks and steep inclines. Again, it's really easy for them to get hurt strutting around the mountains, so they evolved hard hooves to protect their feet.
3-PGA is the important metabolic intermediate in light independent reactions of photosynthesis.
PGA
<u>Explanation:</u>
Light-independent reaction in photosynthesis is called Calvin cycle and the reaction doesn’t directly require sunlight. But it still needs the products of light reaction. In light-independent reaction carbon dioxide is fixed from inorganic form into an organic form.
In the fixation each molecule of carbon dioxide reacts with RuBP and forms two molecules of 3-PGA at a time. The reaction is catalyzed by the enzyme RuBisCO. Since 3 molecules of RuBP are involved a total of 6 molecules of 3-PGA will be formed in fixation.
Here the 3-PGA is the intermediate and in the next stage it will get reduced to G3P(Glyceraldehyde -3 phosphate).