| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
Which of the following is true about species groups?
a population is made up of a group of communities |
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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 |
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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.
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
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day and night cycle |
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tides |
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the northern lights |
Tides are caused by the gravitational interaction of Earth and the Moon.
Gametes have how many pairs of chromosomes?
23 |
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46 |
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4 |
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2 |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.
When light travels between two substances it bends. This is called:
conduction |
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refraction |
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reflection |
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convection |
Because different materials have different refractive indices, light changes speed when passing from one material to another. This causes the light to bend (refraction) at an angle that depends on the change in refractive index between the materials. The greater the difference, the higher the angle of refraction.
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.