Answer:
A cell uses active transport to move molecules across a cellular membrane when the molecules are being moved against a concentration gradient.
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Answer:
A. Increasing surface area to improve nutrient absorption between the digestive and the circulatory systems.
Explanation:
Our intestines, on the inside, are lined with the intestinal mucosa. This mucosa is not straightened, as it might seem macroscopically; it rather has this wavy appearance forming folds. Also, epithelial cells in this mucosal layer have lots of small finger-like extensions called the villi.
Folds and villi increase the contact surface between the nutrients in the lumen and mucosa, thus increasing the rate of absorption of these nutrients between the intestines and the blood vessels below the epithelium.
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The independent SiO4 4- tetrahedra join with the Mg2+ and Fe2+ ions to generate the mineral olivine in the rock peridotite.
Olivine is the naming of group-producing minerals, which are usually found in ultramafic and mafic rocks, like gabbro, basalt, diabase, dunite, and peridotite. They are generally green in appearance and exhibit constituents, which generally range between Fe2SiO4 and Mg2SiO4.
