A semipermeable membrane is any biological or synthetic membrane that allows certain molecules or ions to pass through while restricting others.
Answer:
Cold, dense air squeezes its way through the warmer, less-dense air, and lifts the warm air. Because air is lifted instead of being pressed down, the movement of a cold front through a warm front is usually called a low-pressure system.
Explanation:
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I would say tropism because plants can’t respond to their environment by controlling gravity!
Explanation:
While many asteroids are composed primarily of rock and metal, most Kuiper belt objects are composed largely of frozen volatiles (termed "ices"), such as methane, ammonia and water. The Kuiper belt is home to three objects identified as dwarf planets such as : Pluto, Haumea and Makemake. hope it help you.
It weighs approximately 2 pounds. The weight doesn't change until you leave the atmosphere; it just measures the effect of gravity on your body.