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Practice Reading: Fill in The Blanks (Drag & Drop)
ID: #5416
Cell 2
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All human life starts as a single-cell; this has been well-documented. However, did you know that a single cell, with the for life, was formed before your mother was born? So, if your mother was 30 when she had you, on your 18th birthday you could arguably consider yourself 48 years old!
But what about the chemicals which make up your body? Well, they’re borrowed for a fairly short period. Hydrogen, the most common chemical, was formed 13.7 billion years ago. Carbon and oxygen were made in the middle of stars 12 billion years ago. You are, in fact, stardust! But, of course, not all of the human body is human. In fact, there are few human cells, compared to bacteria - ten times fewer, in fact. Many influence health and bacteria are definitely one of them. One experiment strongly linked bacteria to well-being when a scientist attempted to raise animals in a bacteria-free environment. Many died and those that did survive needed an diet to keep them alive. It seems bacteria are a necessary part of the we enjoy.
But what about the chemicals which make up your body? Well, they’re borrowed for a fairly short period. Hydrogen, the most common chemical, was formed 13.7 billion years ago. Carbon and oxygen were made in the middle of stars 12 billion years ago. You are, in fact, stardust! But, of course, not all of the human body is human. In fact, there are few human cells, compared to bacteria - ten times fewer, in fact. Many influence health and bacteria are definitely one of them. One experiment strongly linked bacteria to well-being when a scientist attempted to raise animals in a bacteria-free environment. Many died and those that did survive needed an diet to keep them alive. It seems bacteria are a necessary part of the we enjoy.
alternative
factors
well-documented
burden
lifestyle
relatively
potential
subjectivity
false
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