Just like an assembly line, the human digestive system has different jobs that have to be done in order for the nutrients and such to be distributed properly throughout the body.
Seismology. Example:
Then there was the development of seismology, the study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies, in the early 20th century
Answer:true
Explanation:water just slips threw sand, but clay holds the water.
It forms the outer layer of a cell. It gives an animal cell its shape. It is selectively permeable.
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Answer:
A) a single variable
Explanation:
An appropriately designed experiment usually involves only one independent variable. This allows the scientist to truly determine whether the variable manipulated is what had an effect on the subject. You may test more than one variable, but this is usually done or experimented separately, or one at a time.