When molecules are being transported opposite to the molecules concentration gradient.
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In general, yes, the dorsal blood vessel of a worm be seen from the worm's exterior because a worm's "skin" is very thin. Although of course there are exceptions.
Answer:
Some types of bacteria can cause diseases in humans, such as cholera, diptheria, dysentery, bubonic plague, pneumonia, tuberculosis (TB), typhoid, and many more. If the human body is exposed to bacteria that the body does not recognize as helpful, the immune system will attack them.
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I am no expert but I think the correct answer is C.
Answer: The genes passed on by the parents can combine in a new way in the child.
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