| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
The hottest of Earth's atmospheric layers is which of the following?
troposphere |
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thermosphere |
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stratosphere |
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mesosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.
The brain and spinal cord make up the __________ nervous system.
autonomic |
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somatic |
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central |
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peripheral |
The nervous system consists of the brain and spinal cord (central nervous system) and the peripheral nervous system which is the network of nerve cells (neurons) that collect and distribute signals from the central nervous system throughout the body.
Examples of secondary consumers include:
chickens |
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plankton |
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wolves |
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grasshoppers |
Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.
Elements in the Periodic Table of the Elements are ordered by which of the following?
atomic mass |
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atomic number |
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atomic weight |
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number of electron shells |
The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.
In cell biology, what part of the cell contains organelles?
cytoplasm |
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cell wall |
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cell membrane |
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nucleus |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles.