| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.07 |
| Score | 0% | 61% |
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
vertebrate |
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spiny |
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arthropod |
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sentient |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Earth's history is divided into time periods, which of these is the shortest time period?
epoch |
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age |
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period |
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eon |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.
Which of the following is the primary difference between a comet and an asteroid?
asteroids have a coma |
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comets orbit the Sun |
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asteroids contain frozen water |
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comets have an atmosphere |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
Which of the following is true about species groups?
a population is made up of a group of communities |
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a community is made up of a group of populations |
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an ecosystem is a biological population |
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a biome is a made up of a group of biospheres |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.
During digestion, where is digested food absorbed into the blood stream?
stomach |
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small intestine |
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large intestine |
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pancreas |
The small intestine is where most digestion takes place. As food travels along the small intestine it gets broken down completely by enzymes secreted from the walls. These enzymes are produced in the small intestine as well as in the pancreas and liver. After the enzymes break down the food, the resulting substances are then absorbed into the blood via capillaries in the small intestine walls.