Sodium and potassium ions are transported across the plasma membrane by a protein. question 2 options: 1) cell-recognition 2) enzymatic 3) receptor 4) channel 5) carrier

satellites are frequently used to make observations of the orbit on earth

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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