| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.06 |
| Score | 0% | 61% |
Which of the following is true about species groups?
an ecosystem is a biological population |
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a biome is a made up of a group of biospheres |
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a population is made up of a group of communities |
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a community is made up of a group of populations |
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.
Menstruation occurs when:
the zygote is formed |
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the ovum fails to become fertilized |
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the fetus is formed |
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the ovum becomes fertilized |
If the ovum fails to become fertilized, the lining of the uterus sloughs off during menstruation. From puberty to menopause, this cycle of menstruation repeats monthly (except during pregnancy).
What prevents blood pumped out of the ventricles from flowing back into the heart?
atria |
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valves |
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capillaries |
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platelets |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
Which of the following is the formula for work?
\(W = {F}{d}\) |
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\(W = \vec{F}\vec{d}\) |
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\(W = {\vec{F} \over \vec{d} }\) |
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\(W = {{F}\over{d}}\) |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meter (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
I biome is made up of naturally occurring flora and fauna. Fauna is which of the following?
habitats |
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minerals |
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animals |
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plants |
A biome is a large naturally occurring community of flora (plants) and fauna (animals) occupying a major habitat (home or environment).