Microscopes
Before the development of microscopes, the existence of cellular life was unknown. By examining a piece of cork, Robert Hooke first saw and named cells. Antony van Leeuwenhoek was the first person to see living cells.
water vapour stays in the atmosphere for a much shorter period of time. Water vapour will generally stay in the atmosphere for days (before precipitating out)
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Among the choice the one that makes human embryonic stem cells that are derived from a 5-day old embryo important to stem cell research is <span>They have the capacity for long-term self-renewal in laboratory culture.</span>
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