The kidneys secrete an enzyme called renin
D. Polar regions receive less solar energy and heat per unit area than tropical regions
Less direct sunlight means that there is less concentration of direct solar rays. This would influence temperature and would ultimately create weather, and since this pattern continues of switching direct ray latitudes, this would create climate zones all over the Earth, and similar ones with similar latitude and terrain.
Because plants go through a cycle(the cycle is seed, seedling, plant, flower and tree.) and it takes time for the plant food, water, and nutrients to go though the plant.
<span>Postthrombotic syndrome involves the formation of blood clots in the body and that is its hallmark. Some of the symptoms include leg pain and swelling. Lipodermatosclerosis involves problems with veins in the leg and is evident by changes in the lower legs.</span>
Answer:
I'm pretty sure the answer is natural selection.
Explanation:
Natural selection acts on phenotypic variations in populations.
