Your Results | Global Average | |
---|---|---|
Questions | 5 | 5 |
Correct | 0 | 3.43 |
Score | 0% | 69% |
Which of the following is the smallest component of an element that still retains the properties of the element?
atom |
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neutron |
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molecule |
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element |
An atom is the smallest component of an element that still retains the properties of the element.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
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vertebrate |
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exoskeleton |
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bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
Veins carry blood __________ the heart.
back to |
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within |
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all of these |
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away from |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
What kind of weather front is likely to create clouds and storms?
stationary front |
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temperate front |
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warm front |
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cold front |
A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Warm air at the surface pushes above the cool air mass creating clouds and storms.
Tough fibrous cords of connective tissue that connect muscles to the skeleton are called:
cartilage |
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ligaments |
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vertebra |
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tendons |
Tough fibrous cords of connective tissue called tendons connect muscles to the skeleton while another type of connective tissue called ligaments connect bones to other bones at joints (elbow, knee, fingers, spinal column).