A scientist who studies living things is called a biologist
Answer:b) The air at high altitudes are less dense, so its harder to breathe.
Explanation:
AS altitude increases, the air pressure drops. This reduces the amount of gas molecules in the air so the air becomes less dense compared to air closer to sea level.
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The sensory nervous system transmits information from receptors to the CNS, while the motor nervous system transmits information from the CNS to the rest of the body.
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Answer:
Plant cells have a cell wall, but animals cells do not.
Plant cells have chloroplasts, but animal cells do not.
Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles, if any are present.
Explanation:
C.) mountain ranges because of convergent boundries
