I believe its A. I could be incorrect though.
Answer: 6
Explanation: There's 4 daughter cells so if there's 24 chromosomes just divide 24 by 4 to get 6.
Answer: The correct answer is -
D) giraffes having increasingly longer necks over time.
Natural selection is an evolutionary mechanism that was proposed by Darwin.
According to this mechanism, organisms that are better capable of adapting to their changing environmental conditions, survive and increase their number through reproduction whereas other are eliminated from the population.
Example - Long neck of Giraffe, which is much elongated, lofty stature, that was beautifully adapted for browsing on the higher tree branches. This was an adaptation with slow and gradual change in the gene frequency as the lower vegetation was eaten by other animals. Due to this, giraffes had to search for other source (that was higher tree branches).
This is considered as a peculiar example of natural selection.
<span>Heating
of the Earth due to the Sun's rays causes convection currents of air
upwards. The warm air moves upwards, while cool air from nearby regions
fills in the lower areas.
Heating of the Earth can cause warm water currents that flow from hot
areas like near the equator and tropical areas, while cold water
currents flow from the arctic and antarctic regions and the temperate
regions.
Areas closer to water bodies have a moderating effect. In the morning
the cool sea breeze comes over the land and keeps the temperature lower
than it would have been as the Sun rises up. In the evening, the warm
sea breeze comes in over the land, and thus the night temperature is
higher than it would have been when the sun has set.
Mountains cause rain carrying heavy dark clouds to rise up, and pass
over it. As a result of this, the clouds tend to precipitate and shed
the water as rain on the Mountain slopes. These form streams and rivers,
and continue to flow usually throughout the year. </span>
