Genetic Drift
Explanation:
Genetic drift is a mechanism of evolution in which allele frequencies of a population change over generations due to chance or sampling error. Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations. This process may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to 100% frequency, of other alleles. It also have major effects when a population is sharply reduced in size by a natural disaster (bottleneck effect) or when a small group splits off from the main population to found a colony (founder effect).
lava
plants and animals
carbon dioxide
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Choose ALL the answers that apply.
The crust is:
the thinnest layer
made of large pieces called plates
mostly made of silicon dioxide
the outermost layer of the earth
also called the hydrosphere
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The ozone layer _____.
is part of the troposphere
is used to send radio signals
protects the earth from UV radiation
is made of charged ions and free electrons
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Answer:
C
Explanation:
Answer: The role of an organism in the ecosystem is called its NICHE.
Explanation: The niche (pronounced 'neesh') of an organism is the specific function and purpose of the organism within its environment, ecosystem or food-web or food-chain.
Answer:
niche
Explanation:
the equator receives more sunlight
the sun's energy is spread out over a smaller area at the equator
the sun's energy is spread out over a larger area at the equator
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What causes seasons?
the earth's rotation
the earth's tilt
the curved surface of the earth
the earth's orbit around the sun
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Warm air _____.
cools as it rises, then sinks back down
keeps rising until it leaves the troposphere
cools as it sinks, then rises into the atmosphere
does not move
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Wind is caused by ___.
the earth's tilt
the Coriolis effect
temperature differences
humidity
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Choose all the answers that apply.
Clouds:
form from condensation
reflect sunlight back into space
trap sunlight in the atmosphere
cause precipitation
are caused by the Coriolis effect
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Which of the following statements is true?
Low pressure is usually means nice weather.
Air pressure is the same over the entire earth.
Worldwide winds are caused by rising air at the poles and sinking air at the equator.
Coastal breezes occur because water heats and cools more slowly than land.
PLEASE AT LEAST TRY PLEASE?
Answer:
1- Option (b)
2- Option (b)
3- Option (a)
4- Option (c)
5- Option (a), (b) and (d)
6- Option (d)
Explanation:
The equatorial region receives more sunlight than the polar region, so the places near equator are warmer than the places at the polar region, including the 80 degrees N latitude.
Seasons are caused due to the tiltation of the earth and the relative position of earth with respect to the sun.
Due to the increasing temperature near the earth's surface, the warm air rises up in the atmosphere, being less denser and eventually sinks due to the lowering temperature.
When there occurs the temperature difference between two different regions, then wind is generated blowing from the region of higher pressure to the region of low pressure.
Clouds are formed when condensation process takes place and are a good albedo that reflects significant amount of sunlight back into the space. Clouds during condensation starts precipitating in the form of rainfall, snowfall and fog.
The difference in the temperature occurs because of the unequal heating of the land surface and the ocean. The land area gets heated up faster and more readily, in comparison to the ocean. So the sea breeze as well as the land breeze occurs. Sea breeze blows from the ocean surface to the land area, whereas land breeze blows from the land area towards the oceans.
B. Burning point
C. Boiling point
D. Chemical stability
Boiling point. If you boil water it changes from a liquid to a gas, which is a physical change. The rest are chemical properties because the chemical make up of an object changes.
q2 suggest y pregnant women cant take some medications
Answer 1
The fertilisation occurs in the fallopian tube. By about the fifth day after fertilisation, the embryo finally reaches the uterus, where it implants itself in the endometrium, or uterine lining. Furthermore, implantation of a fertilised ovum is most likely to occur around 9 days after ovulation, however, this can range between 6 and 12 days.
Answer 2
Not all but certain medicines should not be taken by pregnant women because it can increase blood pressure, thinning of blood and it can increase contraction in the uterus causing the uterine lining to shed leading to miscarriage.