The original source of all genetic variation is <span>mutation.</span>
Answer:
This is the diffusion (loss of water vapor) from the stomata (most cases) of a plant to its external environment.
It involves movement of water vapor down the water potential gradients; that is ; from higher water potential inside the leaf to lower water potential in the surrounding environments.
its cools the plant’s internal temperature as water vapour conveys heat out of plants' cells.
Endocrine glands are responsible for <span>regulating body activities. The correct option among all the options that are given in the question is the second option or option "B". The endocrine system basically acts as long distance signalling system for the body. I hope that the answer has helped you.</span>
Answer:
Rocks on land
Explanation:
The salt in the ocean comes from rocks on land.
The short answer is: The scientist means that a dose of 20 mg per kilogram is enough to kill one half or fity percent of the animals used in the test. LD stands for leathal doseage. The 50 means 50 percent. Subsequently a dose of 20 mg per killogram has a lethal dose that will kill 50% of the test subjects.
