Homologous structures are defined as similar physical structures, which share a common ancestor. These similar structures perform different functions.
Thus, the hypothesis that suggests the different structures of the organisms is that these organisms shared a common ancestor.
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The answer is D because if they are similar it means that they share a distant ancestor they evolved from.
B) it gets more direct sunlight.
C) the Earth is closer to the Sun.
D) it is tilted away from the Sun.
Answer:
Option (B)
Explanation:
When the tilt of the earth is towards the sun, then it is called summer in the northern hemisphere. In this position, the sunlight is directly over the earth, as a result of which it absorbs more amount of heat. Spring is the season that starts from about 21st March to 21st of June or it can be considered as the season that exists between the summer and winter. Here, a high amount of sunlight is absorbed due to which the temperature eventually rises.
This is the reason why the northern hemisphere is relatively warmer during the spring season than in winter.
Hence, the correct answer is option (B).
Answer:
When we observe the position of a star its position changes over the course of a year. It will return to the same position a year after the first measurement. This effectively proves that the Earth is in orbit.
Diseases are believed to continue in human populations originally because of a balance among mutation, genetic drift, and natural selection, with alleles that provide to infection preceded by mutation, directed in part by stochastic genetic drift, but eventually excluded from the population by cleaning selection.
Those most susceptible are more likely to get complications and die or be less fit. If the sensitivity were genetic fewer survivors would presumably have some descendants. Those with better resistance would rise in proportion to those with comparatively lacking immunity all other things being alike. That change in the ratio of genetic types would be evolution by natural selection. Modern medicine involves that a bit by usually curing most diseases.
Ice forms from the top of the water column down, creating a protective barrier over the liquid water.
The higher-density liquid water shelters organisms from cold air better than the less-dense ice.
The higher-density liquid water traps nutrients for primary producers better than the less-dense ice.
Answer:
The higher-density liquid water shelters organisms from cold air better than the less-dense ice.
Explanation:
Because of this difference in density, the waters of lakes and seas do not freeze completely because a less dense ice layer forms on the surface and creates a natural thermal insulator that makes the water below it remain in the liquid phase. This saves the animal and plant life of lakes and seas.
Ice works as a thermal insulator because its specific heat (2.03 J/g. ºC) is lower than that of water (4.18 J/g. ºC).
After the cold is over and the hot season comes, the surface ice melts easily. But that would not happen if the ice dropped to the bottom of lakes and seas. With this, the animal and plant life would be compromised.
Another important point is that, as already mentioned, liquid water reaches its maximum density at approximately 4ºC, which is 1,000 g/cm3. Therefore, during times such as spring and fall, the water reaches temperatures near this and becomes denser than the rest, going to the bottom. This causes a vertical movement called the convection current, which is responsible for mixing the nutrients dissolved in water.
The higher-density liquid water shelters organisms from cold air better than the less-dense ice.
Who are the “men of goodwill” that Gladden describes?
A. social Darwinists
B. wealthy people
C. immigrants
D. reformers
The “men of goodwill” that Gladden describes are the reformers. That is option D.
A reformer is an individual that fights for a positive change in their society.
From the excerpt, the reformers are those men of goodwill that go out if their way to organise ways to save their people.
Therefore, the “men of goodwill” that Gladden describes are the reformers.
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