The UV rays cause sun spots due to reaction from the radiation.
Main function – upwards water transport. The xylem, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting channels reaching all parts of the plants. The system transports water and soluble mineral nutrients from the roots throughout the plant.
The brown rabbits will reproduce effectively whereas the white rabbits will not survive in the events when the winter will get warmer with warmer temperature lasting longer.
Explanation:
The theory of Darwin suggests the Survival of the Fittest. The brown rabbits due to their adaptive skin color to the warmer temperature that is summer when everything in the environment goes pale due to heat will help them survive.
Similar in context, winter brings snow and so the white rabbits will thrive in more. But when the natural pursuit of temperature or climate changes, the brown rabbit lasting longer in warmer temperature will survive more with white ones wiping out.
Answer:
Calcium
Explanation:
Parathyroid hormone (PTH) is a hormone that is secreted by the parathyroid gland. It is the major regulator of the plasma concentration of calcium ions. It regulates calcium ions in the kidney, intestine and bones.
In the kidney, is involved in the re-absorption of calcium in distal ducts and the renal collecting duct, it is also involved in activating the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol).
In the intestine, PTH is involved in the absorption of calcium, by increasing vitamin D production.
In the bone, it helps in regulating calcium levels; when serum calcium level is low, PTH stimulates the activity of the osteoclast, to produce more calcium.
Stalks of wheat are displayed during harvest season as symbols of fertility, life and abundance is the best example of non-science. Thus, option B is correct. since the selective breeding of wheat grains is science term.
<h3>
What is selective breeding?</h3>
Selective breeding which applies artificial selection by human when they can control breeding process of organisms in order to introduce or eliminate a desirable character or trait.
Majority of breeding focuses on the beneficial traits for humans, where the beneficial trait pass from parent to offspring via genes.
The desirable phenotypic traits are passed from parents to offspring via their genes.
Th drawbacks of selective breeding in some case the undesirable traits which cause hereditary and health problems.
Learn more about selective breeding, here:
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