The mass remains the same given that the number of air molecules remain the same and none did escape into the atmosphere.
As heat is being absorbed by the air molecules, they vibrate more vigorously and the electrostatic forces of attraction between the molecules weaken and they become further apart. Hence there is lesser number of air molecules per volume, indicating that density has decreased.
Answer:
the answer is A
Explanation:
just got done with that unit
<span>another as closely because they share fewer genetic characteristics. ... Similarly, we cannot use the biological species concept species concept is that biologists can apply it to any group of organisms, including species that have long.flow between them—one of the key requirements of the biological species definition.</span>
The biological species concept gives an explanation of how species form (speciation). A biological species is a group of individuals that can breed together (panmixia). However, they cannot breed with other groups. In other words, the group is reproductively isolated from other groups.
<span>"The words 'reproductively isolated' are the key words of the biological species definition".</span>
According to Ernst Mayr, a new species forms when an existing species splits. A similar idea had been suggested in the 19th century by Moritz Wagner. Dobzhansky described the role of reproductive isolation in the formation of new species.Once a species lives in two different areas, the geographical isolation
makes breeding between the groups reduce or stop. Each group develops
features which make breeding between them work less well. Eventually,
each group becomes a 'good' biological species, because the two species
do not reproduce with each other even when they are together.
This is still considered the most common reason for species splitting, and has the technical name of allopatric speciation. It is contrasted with sympatric speciation where speciation takes place even though all the members live in the same area.<span />
<h2>
Hey There!</h2><h2>
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Answer:</h2>
The simple answer for that will be that they are not complex organisms. Earthworms are simple organism with the small body,
So as there body is not that big thus they don't need any specialized organ system for the process of respiration. Every organism has the complex systems according to fulfill their needs, and most certainly the skin is very convenient medium for the respiration by the diffusion process.
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<h3>BLOOD CIRCULATORY SYSTEM:</h3>
They have a specialized system where it was needed, THE BLOOD CIRCULATION SYSTEM, There body is small but long and need blood to transfer the oxygen to each part of the body. There blood have the haemoglobin(it carries the oxygen), thus it is red just like us.
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<h3>SKIN:</h3>
Skin as a respiratory medium, needs to be thin, wet and cover large surface area than volume. The Skin fulfills all these Prerequisites, thus it is a perfect organ for the respiration. Even our respiratory medium which is alveoli is wet, thin and cover REALLY large surface area more than our body. If the skin dries, there will be no diffusion and worm will die due to dessication.
<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2 />