<span>The ring of muscles that guards the opening between the stomach and the duodenum is the </span>pyloric sphincter
Answer:
Annual mean temperature and annual mean precipitation.
Explanation:
The major biomes of North American biomes include almost every one of these biomes, Tundra., Boreal, Deciduous, Prairie, Desert, montane and tropical. All these biomes are effects or influence the distribution of organisms by several biotic and abiotic factors as the organism is found in the biomes that help in their livelihood.
Abiotic factors that influence the biomes that are present in North America most are temperature and precipitation that can be measured in Annual mean temperature and precipitation.
Thus, The correct answer is - annual mean temperature and annual mean precipitation.
Nitrogen has to be converted or ‘fixed’ to a more usable form through a process called fixation
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D because a positive attracts a negative but i could be wrong
