Answer:
O 6
Explanation:
Oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.
Carbon monoxide blocks oxygen in the blood. Hence, option A is correct.
<h3>What is combustion?</h3>
Combustion is a chemical process or a reaction between Fuel (Hydrocarbon) and Oxygen.
During incomplete combustion part of the carbon is not completely oxidized producing carbon monoxide (CO). Incomplete combustion uses fuel inefficiently and carbon monoxide is released.
Carbon monoxide gas diffuses rapidly across the pulmonary capillary membrane, binding to haemoglobin with an affinity 200 times that of oxygen to form carboxyhemoglobin. By displacing oxygen, CO decreases the oxygen-carrying capacity and oxygen delivery to tissues, causing marked cellular hypoxia and acidosis.
Hence, option A is correct.
Learn more about combustion here:
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The answer is D:store
It is hard to store thermal energy because it just dissipates rapidly.
The answers are as follows:
1) Evolution is still taking place in the Galapagos finches
Why?
Evolution basically consists on random mutations that affect the population of a species, that are conserved when those mutations help the affected individuals to better adapt to their environment, in a process known as natural selection.
Random mutations are still affecting the finch population in the Galapagos Islands, and when one of those mutations provides an advantage, the species will continue to evolve. However, these changes occur over long periods of time, and its unlikely that we will see the evolved species in our lifetime.
2) Human activities can lead to speciation
Speciation is the process in which new species are created by natural or artificial selection.
Why?
Human activities can speed up this process by creating external pressure in the form of artificial selection. There are many examples of this in our history, but common cases are the separation of the Dog (<em>Canis familiaris</em>) from the Wolf (<em>Canis lupus</em>). Wolves with desirable traits (non-aggressive, cooperative, small size) were artificially selected by humans and in time, a new species was created. Other examples can be the different species of cattle and sheep.
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