| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
In the metric system, what prefix represents 10-3?
kilo |
|
milli |
|
centi |
|
mega |
In the metric system, milli is the prefix for 10-3.
Which of the following describes how a person's genes express themselves in physical characteristics?
genotype |
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chromotype |
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DNA |
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phenotype |
A person's genotype is their genetic makeup and includes both dominant and recessive alleles. Phenotype is how the genes express themselves in physical characteristics.
During digestion, the kidneys filter substances from the blood. Which of the following is not filtered by the kidneys?
fats |
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water |
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minerals |
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salt |
Chemical waste like excess water, minerals, and salt are filtered from the blood by the kidneys and secreted into the urine. Urine is transported from the kidneys to the bladder through ureters.
In the food chain, bacteria and fungi convert the organic matter in the dead bodies of plants and animals into simple nutrients. Bacteria and fungi are:
decomposers |
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producers |
|
scavengers |
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primary consumers |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
Which of the following is related to the Cambrian Explosion?
first civilizations |
|
carbon dating |
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extinction of dinosaurs |
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fossil record |
The Cambrian period is one of the most significant geological time periods. Lasting about 53 million years, it marked a dramatic burst of changes in life on Earth known as the Cambrian Explosion. It is from this period that the majority of the history of life on Earth, as documented by fossils, is found. Called the fossil record, the layering of these mineralized imprints of organisms preserved in sedementary rock have allowed geologists to build a historical record of plant and animal life on Earth.