Answer:
The cycle has no beginning and no end. Rocks deep within the Earth are right now becoming other types of rocks. Rocks at the surface are lying in place before they are next exposed to a process that will change them.
Explanation:
There is no beginning or end to the rock cycle, since all rocks on Earth can be influenced by the cycle and develop into new types.
Answer:
Option A, Pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction
Explanation:
Genetics variation allows as organism to evolve in a way to be able to cope up with the existing or changing environmental condition. Now, a Pantala flavescens undergoes sexual reproduction, thus only this creature has the ability among all the given organism to evolve genetically and be able to survive in this environment. All the remaining organisms reproduce asexually and hence there is no variation with in them and hence it would be difficult for these organisms to cope up with changing environment.
Hence, option A is correct.
Although only a small portion of water absorbed by the plant is used in photosynthesis, a shortage of water does affect the rate photosynthesis occurs. Even a slight deficiency of water results in significant reduction in the crop yield. The lack of water not only limits the amount of water, but also the quantity of carbon dioxide available for photosynthesis. This is because in response to drying the leaves close their stomata in order to conserve water being lost as water vapor through them. Care should be take to assure that both optimal oxygen and water are available to the roots at all times.
